Ask the Scholar

{
    "localId": "951892",
    "label": "Virginia Data File",
    "core": "doc",
    "dtoType": "document",
    "citationUrl": "https://catalog.archives.gov/id/951892"
}

{
    "id": "951892",
    "sourceUrl": "https://catalog.archives.gov/id/951892",
    "contentType": "document",
    "title": "Virginia Data File",
    "citationUrl": "https://catalog.archives.gov/id/951892",
    "collections": [
        "Records of the Center for Demography and Ecology, University of Wisconsin - Madison",
        "Master Area Tract Identification, Latitude and Longitude Descriptive Array (MATILDA) Tract Extract Files from the 19th Census of Population and Housing"
    ],
    "subjects": [
        "Virginia"
    ],
    "iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-CDE/MATILDA/MATILDA.TE.VA.txt",
    "thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-CDE/MATILDA/MATILDA.TE.VA.txt",
    "largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-CDE/MATILDA/MATILDA.TE.VA.txt",
    "imageCount": 3,
    "hasImages": true,
    "source": "import",
    "hasTranscription": false
}

{
    "url": "https://catalog.archives.gov/id/951892",
    "naId": 951892,
    "levelOfDescription": "fileUnit",
    "recordType": "description",
    "ocrSource": "nara-archive"
}

{
    "seq": 2,
    "pageIndex": 0,
    "type": "document",
    "url": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-CDE/MATILDA/495_1DP.pdf",
    "mediaId": "812996b74ebd67b1",
    "ocrText": "RECORDS AND ARCHITES ADMINISTRATION TYNOLLIN\nNational Archives and Records Administration\n8601 Adelphi Road\n1985\nCollege Park, Maryland 20740-6001\n1970 Census Master Area Tract Identification, Latitude and\nLongitude Descriptive Array (MATILDA)\nTract Extract Files\nCenter for Demography and Ecology,\nUniversity of Wisconsin-Madison, Collection (CDE)\nDonor Documentation Contents:\n# Pages\nDocumentation\n15\nTotal\n15\nNARA Prepared Documentation:\nUser note\n1\nSample Printout of MATILDA Tract Extract Files\n2\nArchival Electronic Records Inspection and\nControl (AERIC) Reports\nAvailable\nUpon\nRequest\nTheodore J. Hull\nNN3-CDE-01-001\nAugust 13, 2002\nNARA's web site is http://www.archives.gov\nNARA Reference Copy\nRECCORDS AND ARCHIVES ADMINISTRATION TYNOLIN\nNational Archives and Records Administration\n8601 Adelphi Road\n1985\nCollege Park, Maryland 20740-6001\nUser Note\n1970 Census Master Area Tract Identification, Latitude and\nLongitude Descriptive Array (MATILDA)\nTract Extract Files\nCenter for Demography and Ecology,\nUniversity of Wisconsin-Madison, Collection (CDE)\nAugust 13, 2002\nDocumentation: The documentation for the Master Area Tract Identification, Latitude and\nLongitude Descriptive Array (MATILDA) Tract Extract Files pertains to a number of series of\n1970 Census Geographic Identification Code Scheme Tape Files prepared by the National Data\nUse and Access Laboratories (DUALabs). Note that NARA also has available the MEDList\nExtended with Geographic Coordinates (MED-X) files, accessioned into the Records of the\nBureau of the Census (Record Group 29).\nThe documentation contains a number of handwritten makings suggesting that the files available\nfrom the National Archives are the MATILDA, rather than the MATILDA Tract Extract files.\nThe original file identifiers for the files obtained from the Center for Demography and Ecology\nmatch those appearing on page 5 of the original documentation and identified as the MATILDA\nTract Extract files. Therefore, we determined these files to be the MATILDA Tract Extract\nfiles.\nNote also that the documentation describes records of 132 characters in length. The records are\n129 characters in length with the 129th character a blank.\nTHEODORE J. HULL\nArchivist\nElectronic & Special Media Records Services Division\nNARA's web site is http://www.nara.gov\nNARA Reference Copy\nRECCORDS AND ARCHIVES ADMINISTRATION TVNOLLIN\nNational Archives and Records Administration\n8601 Adelphi Road\n1985\nCollege Park, Maryland 20740-6001\nTheodore J. Hull\nAugust 13, 2002\n3-CDE-01-001\nSample Dump of the\n1970 Census Master Area Tract Identification, Latitude and\nLongitude Descriptive Array (MATILDA)\nTract Extract Files\nCenter for Demography and Ecology,\nUniversity of Wisconsin-Madison, Collection (CDE).\nFollowing is a page copied from a sample of records printed from the 1970 Census Master Area\nTract Identification, Latitude and Longitude Descriptive Array (MATILDA) Tract Extract File for\nAlabama, created from the records as preserved by the Electronic & Special Media Records Services\nDivision (2002-3273). The remaining files were preservation copied on 2002-3274 through 3323.\nThe National Archives used File Transfer Protocol (FTP) to transfer the MATILDA Tract Extract\nFiles from the Center for Demography and Ecology. The files were then copied to a CD-ROM, in\nASCII, with fixed length records. The files were then preservation copied by the National Archives\non to 18-track, 37,871 bpi, 3480-class tape cartridges in ASCII, with ANSI standard labels and fixed\nlength records. The sample dump includes an ASCII dump on the right hand side and a hexidecimal\ntranslation of the ASCII characters on the left.\nNARA's web site is http://www.nara.gov\nNARA Reference Copy\nDump\nAPS RECORD DUMP\nDate: 08/05/2002 Time: 5:38\nM16578\nFILE #1 BLOCK # 0 RECORD # 0\nDS#1\n0000 30 31 36 33 20 20 20 20 20 20 20 20 20 20 20 20\n0163\n0010 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20\n0020 20 20 20 20 20 20 20 20 20 20 20 20 20 20 41 4C\nAL\n(1st 5 Recs)\n0030 41 42 41 4D 41 20 20 20 20 20 20 20 20 20 20 20\nABAMA\n0040 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20\n0050 20 20 20 20 20 20 20 20 20 20 20 20 20 31 31 31\n111\n0060 38 39 34 38 30 33 34 34 34 31 36 35 30 30 30 30\n8948034441650000\n0070 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30\n0000000000000000\n0080 0A\nFILE #1 BLOCK # 0 RECORD # 1\n0081 30 31 36 33 30 30 31 30 30 31 31 20 20 20 20 20 01630010011\n0091 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20\n00A1 20 20 20 20 20 20 20 20 30 35 30 35 36 20 41 55\n05056 AU\n00B1 54 41 55 47 41 20 20 20 20 20 20 20 20 20 20 20\nTAUGA\n00C1 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20\n00D1 20 20 20 20 20 20 20 20 20 20 20 20 20 30 30 30\n000\n00E1 37 33 39 30 30 30 30 32 34 34 36 30 30 30 30 30\n7390000244600000\n00F1 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30\n0000000000000000\n0101 0A\nFILE #1 BLOCK # 0 RECORD # 2\n0102 30 31 36 33 30 30 31 30 30 31 31 30 30. 35 20 20 01630010011005\n0112 20 20 37 20 20 20 20 20 20 20 20 20 20 20 20 20\n7\n0122 20 20 31 36 33 30 32 35 30 35 30 35 36 31 52 45\n163025050561RE\n0132 4D 41 49 4E 44 45 52 20 4F 46 20 4D 43 44 20 28\nMAINDER OF MCD (\n0142 4F 52 20 43 43 44 29 20 20 20 20 20 20 20 20 20\nOR CCD)\n0152 20 20 20 30 30 30 37 20 31 20 20 30 34 30 30 30\n0007 1 04000\n0162 30 35 33 38 30 30 30 30 32 30 30 36 30 30 30 30\n0538000020060000\n0172 38 36 37 31 32 32 30 30 30 30 33 32 34 35 33 38\n8671220000324538\n0182 0A\nFILE #1 BLOCK # 0 RECORD # 3\n0183 30 31 36 33 30 30 31 30 30 31 31 30 30 35 30 31\n0163001001100501\n0193 31 35 34 30 32 20 20 20 20 20 20 20 20 20 20 20\n15402\n01A3 20 20 31 36 33 30 32 35 30 35 30 35 36 31 41 55\n163025050561AU\n01B3 54 41 55 47 41 56 49 4C 4C 45 20 20 20 20 20 20\nTAUGAVILLE\n01C3 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20\n01D3 20 20 20 30 30 30 36 20 31 20 20 30 34 30 30 30\n0006 1 01000\n01E3 30 32 37 33 30 30 30 30 30 38 37 30 30 30 30 30\n000004800000ELZ0\n01F3 38 36 36 35 34 37 30 30 30 30 33 32 34 33 33 30\n8665470000324330\nPage 1\nNARA Reference Copy\nDCA\nNational Data Use and Access Laboratories\n*** IN 20% OF THE CASES\nJuly 1971\nTHE LONGITUDINAL AXIS\nTechnical Document No. GT-1\nis CALCULATED INCORRECTLE\n1970 Census Geographic Identification Code Scheme Tape Files\n(Description of file contents and technical conventions)\nFile Titles\nI. Geographic Area Code Index (GACI) Geographic Codes and Area Names for\nStates, Counties, Minor Civil Divisions (or Census County Divisions),\nand MCD (CCD) /Place Segments.\nII. Master Enumeration District List (MEDList): Geographic Codes and Area\nNames, plus Total Population and Housing Unit Counts for all the areas\nin GACI, plus individual Enumeration Districts and Blockgroups.\nIII. MEDList Extended with Geographic Coordinates (MED-X) Content and areas\nthe same as in MEDList with the addition of Latitude and Longitude\nCoordinates for Enumeration Districts and Blockgroups only.\nIV.A. Master Area Tract Identification, Latitude and Longitude Descriptive\nArray (MATILDA): Geographic Codes, Area Names, and Total Population and /\nHousing Unit Counts for States, Counties, MCD's (CCD's), and MCD (CCD)\nplace Segments as in MED-X; plus Geographic Codes, Area Names, Total\nPopulation and Housing Unit Counts, and Average Latitude-Longitude Coordi-\nnates for Census Tracts in Tracted Areas and Place Segments and MCD Re-\nmainders plus MCD's lacking Places outside Tracted Areas (these latter\nrecords summarized from the ED's and Blockgroups in the order as found\nin MED-X).\nIV. MATILDA Tract Extract: Geographic Codes, Area Names, and Total Population\nand Housing Unit Counts for States and Counties; plus Geographic Codes,\nArea Names, Total Population and Housing Unit Counts, and Average Latitude-\nLongitude Coordinates for Census Tracts in Tract Sequence and those Place\nSegments and MCD Remainders and MCD's without places lacking Tracts.\nNote: MATILDA Tract Extract is available in a special formatted printout.\nSee Appendix for Description.\nPages\nContents of Documentation\nreverse cover\nIntroduction I. Technical Conditions Affecting Use of Geographic Files\n1-6\nA. Technical Characteristics of Magnetic Tape Recording\n1-2\n2-4\nB. Sequence of Files\n4-6\nC. File Label Formats\n7-18\nII. Description of Contents of Files\nA. Layout of File Logical Records including Display Examples\n7-13\n14-18\nB. Codes, Definitions, and Explanations\nAppendix: Description of MATILDA Tract Extract Special Printout\n1411 Jefferson Davis Highway\nArlington, Virginia\n22202\nPhone (703) 920-8300\nSuite 910\nNARA Reference Copy\nIntroduction\nchnical Document GT-1 describes geographic identification code scheme linked files\neveloped for the 1970 consus. These filos, which contain area names data\ntapes willin identify geographic areas by codes only. They also serve other\ngeographic codes, facilitate working with the 1970 census summary\npurposes.\nThe counties, minor civil divisions (or census county divisions), and MCD(CCD)/place\nGeographic Area Code Index file (GACI) was created to join the names of states,\nsegments with the geographic codes specific to each.\nMaster Enumeration District List file (MEDLIST) performs the same function, the but\nThe adds codes for individual enumeration districts and blockgroups and includes\ntotal population and housing unit counts for each area in the file.\nMEDLIST Extended with Coordinates (MED-X) provides, in addition to the above,\nThe latitude and longitude coordinates for each enumeration district and blockgroup.\nArea Tract Identification, Latitude and Longitude Descriptive Array\nThe Master summarizes ED and blockgroup records to the census tract level unit in the\n(MATILDA) found on the MED-X tape, providing total population and housing\norder counts as plus the average latitude and longitude coordinates for each tract. MATILDA\nsimilarly summarizes enumeration districts outside tracted areas to the place seg-\nMCD remainder, and MCD levels in the order as found in MED-X. Finally,\nment, MATILDA includes all state, county, MCD, and place segment records found in MED-X.\nThese have total population and housing unit counts but not coordinates.\nTract Extract focuses on tracts. The state and county records from MED-X\nATILDA present, but all place segment and MCD records without coordinates are eliminated.\nThe are tract summaries are sequenced in tract order following the summaries for MCD's,\nplace segments, and MCD remainders lacking tracts.\nTechnical Document GT-1 describes all of the above files, indicating their many\nelements and also each file's unique elements. An Appendix to Technical\ncommon Document GT-1 describes a specially=formatted version of MATILDA Tract Extract which\nis available as computer printout.\nNote: for visual identification of the codes and area names specified in the\ngeographic tape files, users should consult the Census Metropolitan, County, and\nPlace Maps.\nNARA Reference Copy\n-1-\nI. Technical Conditions Affecting Use of Geographic Files\nTechnical Characteristics of Magnetic Tape Recording\n1. Computer on which files originally prepared:\nGACI, MEDLIST, and MED-X: UNIVAC 1107/1108 and IBM 1401 for 7-track;\nIBH 360/40 for 9-track\nMATILDA and MATILDA Tract Extract: IBM 360/65\n2. Computer on which user's tape copy created: IBM 360/65\n3. Tape width, reel size, and tape length: .5 inch width; 10.5 inch diameter,\nmaximum 2,400-foot length\n4. Recording mode: NRZI (non-return to zero)\n5. Language: Binary Coded Decimal (BCD) for 7-track; Extended Binary Coded\nDecimal Interchange Code (EBCDIC) for 9-track. A limited set of characters\nis used. (See \"Technical Conventions for the 1970 Census Summary Tapes,\"\n1970 Census Users' Guide, Part II.)\n6. Density and Track: 556 or 800 CPI for 7-track; 800 or 1600 CPI for 9-track\n7. Parity: Even for 7-track; Odd for 9-track\n8. Recorded tape representation: One 6-bit character per tape frame for\n7-track; One 8-bit character (byte) per tape frame for 9-track\n9. Labels: Standard IBM OS labels or OS unlabeled (see section I.C. on File\nLabel Formats)\n10. Logical Record Size:\nGACI: 84 characters (blocked 24)\nMEDLIST: 108 characters (blocked 18)\nMED-X: 132 characters (blocked 15)\nMATILDA: 132 characters (blocked 15)\nMATILDA Tract Extract: 132 characters (blocked 15)\n11. Blocking Factor or Physical Record Size:\nGACI: 2,016 characters (or 24 logical records)\nMEDList: 1,944 characters (or 18 logical records)\nMED-X: 1,980 characters (or 15 logical records)\nMATILDA: 1,980 characters (or 5 logical records)\nMATILDA Tract Extract: 1,980 characters (or 15 logical records)\n12. Interblock spacing: .75 inch for 7-track; .6 inch for 9-track\n13. Volumes:\nGACI: 1 tape reel for the U.S.\nMEDList: 3 reels or 2 reels (800 or 1600 CPI) for the Nation, state-morged,\n1 reel per state, state-separate\nMED-X: 4 reels or 2 recls (800 or 1600 CPI) for the Nation, state-merged;\n1 reel per state, state-separate\nMATILDA: 2 recls or 1 reel (800 or 1600 CRI) for the Nation, state-morged\n1 recl per state, state-separate\nMATILDA Tract Extract: 1 recl for the Nation, state-mergod, 1 reel per\nstate, state-separate\nNARA Reference Copy\n-2-\n14. Total Size of Files:\nCACI: Approximately 60,000 logical records for the U.S.\nMEDList: Approximately 390,000 logical records for the U.S.\nMED-X: Approximately 390,000 logical records for the U.S.\nMATILDA: Approximately 175,000 logical records for the U.S.\nMATILDA Tract Extract: Approximately 100,000 logical records for the U.S.\nB. Sequence of Files\nGACI: This file contains records for states, counties, minor civil divisions\n(or census county divisions), and MCD (CCD) /place segments. The file is in sort\nby state (1970 State Code) by county (Federal Standard County Code) by MCD (or\nCCD) by place. The first record is for state 01. The second record is for\ncounty 001 in that state. The third record is for MCD (or CCD) 001 in that\ncounty, and the fourth record is for BCD(CCD)/place segment 0001 (where applica-\nblc). After all the place segments for a given MCD (or CCD) are presented,\nthe next MCD and its place segments follow until all the MCD's for a given\ncounty and their place segments are presented. Then the next county follows\nand the pattern repeated until all the, counties in a given state and their MCD's\nand MCD/place segments are presented. Then the next state follows and the\nentire pattern repeated.\nSee Display Example I in section II.A. for a specimen tape dump of the GACI\nfile showing the sort sequence.\nMEDList: This file contains records for states, counties, minor civil divisions\n(or census county divisions), MCD(CCD)/place segments, enumeration districts and\nblockgroups. The file is in sort as in GACI by state by county by MCD (or CCD)\nby place, and then by census tract (where applicable) by ED and blockgroup.\nHence, in tracted areas within MCD/place segment where applicable (including the\nMCD remainder) and MCD elsewhere, the ED's and blockgroups are presented in\ntract order with all the ED's in a tract preceding the blockgroups. sometimes,\nhowever, all the ED's in the entire place segment or MCD are presented first in\ntract order followed by all the blockgroups in tract order. When this happens\nand there are tracts composed of both ED's and blockgroups, the ED and blockgroup\npieces of such tracts may not appear together.\nNote that blockgroups which are split by MCD, place, congressional district,\nannexed territory, or urbanized area boundaries will have two or more records\nwhich are not likely to appear together. These blockgroup splits are indicated\nby a single or double asterisk following the blockgroup number. (Also note that\nwhere blockgroups are split by the city delivery area boundary line, the MEDList\nrecords for these blockgroups pertain only to the portion inside the city de-\nlivery area. The remainder of the blockgroup outside the city delivery area is\ncombined with the ED in which it is located.)\nOutside tracted areas, ED's are in sort by MCD/place segment where applicable\n(including the MCD remainder) and MCD elsewhere.\nSee Display Example II in section II.A for a specimen tape dump of the MEDLIST\nshowing the sort sequence.\nNARA Reference Copy\n-3-\nThis file contains records for states, counties, minor civil divisions\nMED-X: census county divisions), MCD(CCD)/place segments, enumeration districts\nand (or blockgroups, and is in the same sort sequence as the MEDList. See Display\nExample III in section II.A. for a specimen tape dump of the MED-X file showing\nthe sort sequence.\nThis file contains records for states, counties, minor civil divisions file\nMATILDA: census county divisions), and MCD (CCD)/place segments as in MED-X. The\nalso (or contains records summarized from the ED's and blockgroups in the order as\nfound in MED-X for census tracts in tracted areas and for place segments and MCD\nremainders plus MCD's lacking places outside tracted areas.\nfile is in sort by state by county by MCD (or CCD) by MCD (CCD) /place segment\nThe where applicable (including the MCD remainder) by census tract where applicable.\nThis sort sequence means that where tracts are split by MCD or place segment\nboundaries, there will be records for each split part of the tract in separate\nplaces in the file. (However, within place segment or MCD, tract records always\nboth ED's and blockgroups in cases where all the ED's were presented ahead of the\nrepresent entire tracts in tract order. This is true even for tracts composed of\nblockgroups in MED-X. See previous discussion of this point under MEDList.)\nNote that there are records containing average latitude and longitude coordinates\nfor place segments and MCD remainders outside tracted areas and also for entire\nMCD's outside tracted areas which lack places, but no records with coordinates\nfor place segments or MCD's in tracted areas, since the coordinates were calculated\nfor the individual tracts. However, there are records showing total population\nand housing unit counts taken directly from MED-X for all MCD's and place segments\nincluding those in tracted areas. MCD and place segment records lacking coordi-\nnates always precede records with coordinates.\nSee Display Example IV.A. in section II.A. for a specimen tape dump of MATILDA\nshowing the sort sequence. This can be compared to Display Example III for\nMED-X, which includes the same areas, to see how MATILDA was derived.\nMATILDA Tract Extract: This file contains records for states, counties, census\ntracts in tracted areas, and MCD(CCD)/place segments and MCD remainders outside.\ntracted areas plus MCD's (or CCD's) outside tracted areas which lack places.\nThe file is in sort by state by county with all the records outside tracted areas\nappearing first in sort by MCD (or CCD) by MCD(CCD)/place segment where appli-\ncable (including the MCD remainder), followed by all the tracted area records\nin tract sort.\nThe tract records represent summaries for entire tracts, climinating any splits,\nand hence may not be in MCD or place segment sort. In addition, for tracts\nwhich were split, the geographic codes and area name carried on the tract\nsummary record will be as taken from the first ED or blockgroup in that tract\nand may apply to only part of the tract.\nNote that the records from MED-X showing total population and housing unit counts\nbut not coordinates for MCD's and place segments have been eliminated. This means\nthat where place segments or MCD's are tracted or where MCD's outside tracted\nareas have place segments, there are no records showing total population and\nhousing (or geographic codes or area name) for these areas.\nNARA Reference Copy\n-4-\nSee Display Example IV.B. in section II.A. for a specimen tape dump of MATILDA\nTract Extract showing the sort sequence. This can be compared to Display Example\nIV.A. for MATILDA and also to Display Example III for MED-X, both of which in-\nclude the same areas, to see how MATILDA Tract Extract was derived.\nC. File Label Formats\nHeader and trailer labels on DUALabs' 1970 census geographic tape copies are\nstandard IBM OS labels.\nLabels are classified into two required types: \"Volume\" labels, where \"Volume\"\ncoincides with a physical tape reel, and \"File\" labels, where \"File\" has the\nnormal meaning of a collection of related data records, more than or less than\none reel.\nA label is always an 80-character physical record.\nIn the conventions for the 1970 census geographic tapes, labels are restricted\nto the following:\n1. One Volume Header (VOL1) at the beginning of each physical tape reel.\n2. Two File Headers (HDR1,2) at the beginning of each file and at the be-\nginning of each tape reel (following the Volume Header) within file.\n3. One Volume Trailer (EOV1) if end of tape does not coincide with end of file.\n4. Two File Trailers (EOF1,2) at end of file. If end of tape and end of file\ncoincide, use only File Trailers.\nThe rules for tape mark are:\n1. One tape mark separates labels and data, occurring after all labels which\nprecede data, and before all labels which follow data.\n2. Two tape marks appear at the end of tape after EOV or EOF records.\n3. If a file ends within a volume and another file is written on that volume,\nthen one tape mark both precedes and follows the end of file labels) the\nnext file headers appear and are separated from their data by a tape mark.\nLabel content:\nAs noted, the labels on DUALabs' geographic tape copies are standard IBM OS\nlabels. The File Identifier (Data Set Name) which appears beginning in character\n5 of the First File Header Label is specified for each geographic tape file on\nthe following page.\nUnlabeled DUALabs' Geographic Tape Copies\n1970 census geographic tape copies produced by DUALabs without labels simply\ncontain data followed by a tape mark. In the case of state-merged files, where\neach state's data constitutes a separate file and there is more than one file on a\nreel, a tape mark separates each state's data.\nNARA Reference Copy\n-5-\nFile Identifiers for Geographic Tape Files\nGACI: USPRELIM\nMEDList, state-merged file for U.S.: US. FINAL\nThe following File Identifiers for individual states apply as indicated to the\nstate-separate MEDList files; both the state-separate and state-merged MED-X\nfiles (the stato-merged version retains each state's data as a separate file) ,\nsimilarly, both the state-separate and state-merged versions of MATILDA and\nMATILDA Tract Extract.\nState File Identifiers\nMATILDA\nState\nMEDList\nMED-X\nMATILDA\nTract Extract\nALA.\nALA\nMAALA\nMTALA\nAlabama\nALASKA\nALASKA\nMAALASKA\nMTALASKA\nAlaska\nARIZ.\nARIZ\nMAARIZ\nMTARIZ\nArizona\nArkansas\nARK.\nARK\nMAARK\nMTARK\nCALIF.\nCALIF\nMACALIF\nMTCALIF\nCalifornia\nCOLO.\nCOLO\nMACOLO\nMTCOLO\nColorado\nCONN.\nCONN\nMACONN\nMTCONN\nConnecticut\nDelaware\nDEL.\nDEL\nMADEL\nMTDEL\nDGC\n*\nDistrict of Columbia\nD.C.\nMADC\nMTDC\nFlorida\nFLA.\nFLA\nMAFLA\nMTFLA\nGA.\nGA\nMAGA\nMTGA\nGeorgia\nvaii\nHAWAII\nHAWAII\nMAHAWAII\nMTHAWAII\naho\nIDAHO\nIDAHO\nMAIDAHO\nMTIDAHO\nillinois\nILL.\nILL\nMAILL\nMTILL\nIndiana\nIND.\nIND\nMAIND\nMTIND\nIOWA\nIOWA\nMAIOWA\nMTIOWA\nIowa\nKANS\nMAKANS\nMTKANS\nKansas\nKANS.\nKentucky\nKY.\nKY\nMAKY\nMTKY\nLouisiana\nLA.\nLA\nMALA\nMTLA\nMaine\nMAINE\nMAINE\nMAMAINE\nMTMAINE\nMaryland\nMD.\nMD\nMAMD\nMTMD\nMassachusetts\nMASS.\nMASS\nMAMASS\nMTMASS\nMichigan\nMICH.\nMICH\nMAMICH\nMTMICH\nMinnesota\nMINN.\nMINN\nMAMINN\nMTMINN\nMississippi\nMISS.\nMISS\nMAMISS\nMTMISS\nMissouri\nMO.\nMO\nMAMO\nMTMO\nMontana\nMONT.\nMONT\nMAMONT\nMTMONT\nNebraska\nNEBR.\nNEBR\nMANEBR\nMTNEBR\nNevada\nNEV.\nNEV\nMANEV\nMTNEV\nNew Hampshire\nN.H.\nNOH\n*\nMANH\nMTNH\nNew Jersey\nN.J.\nNKJ *\nMANJ\nMTNJ\nNew Mexico\nN.KMEX.\nNUMEX\n*\nMANMEX\nMTNMEX\nNew York\nN.Y.\nNLSY *\nMANY\nMTNY\nNorth Carolina\nN.C.\nNWC\n*\nMANC\nMTNC\nNorth Dakota\nNUDAK\n*\nN. YDAK\nMANDAK\nMTNDAX\nNARA Reference Copy\n-6-\nState File Identifiers (Cont'd)\nMATILDA\ntato\nMEDList\nMED-X\nMATILDA\nTract Extract\njhio\nOHIO\nOHIO\nMAOHIO\nMTOHIO\nOkl \"oma\nOKLA.\nOKLA\nMAOKLA\nMTOKLA\nOREG.\nOREG\nMAOREG\nMTOREG\n0.0000\nPennsylvania\nPA.\nPA\nMAPA\nMTPA\nRhode Island\nR.I.\nR.I.'\nMARI\nMTRI\nSouth Carolina\nS.C.\nSPC\n*\nMASC\nMTSC\nSouth Dakota\nSBDAK\n*\nS.BDAK.\nMASDAK\nMTSDAK\nTENN.\nTENN\nMATENN\nMTTENN\nTennassee\nTexas\nTEX.\nTEX\nMATEX\nMTTEX\nUtah\nUTAH\nUTAH\nMAUTAH\nMTUTAH\nVermont\nVT.\nVT\nMAVT\nMTVT\nVirginia\nVA.\nVA\nMAVA\nMTVA\nWashington\nWASH.\nWASH\nMAWASH\nMTWASH\nWBVA\n*\nWest Virginia\nW.KVA.\nMAWVA\nMTWVA\nWisconsin\nWIS.\nBWISC\n*\nMAWISC\nMTWISC\nWyoming\nWYO.\nWYO\nMAWYO\nMTWYO\n*\nState File Identifiers on the state-merged version of MED-X will not have\nperiods or blanks. Rhode Island, for example, will appear as RI and not\nR.I.; similarly, South Dakota will appear as SDAK and not SBDAK.\nNARA Reference Copy\n-7-\nDescription of Contents of Files\nLayout of File Logical Records including Display Examples\nThe following lists the items which appear in the geographic tape files and\ntheir character position (s) in the file logical records. For specimen tape\nduaps of the files showing record layout, see Display Examples I (GACI),\nII (MEDList), III (MED-X), IV.A. (MATILDA), and IV.B. (MATILDA Tract Extract)\nfollowing this section. Note that each type of record in a file (state, county,\nMCD, etc.) contains only those items applicable to it with the remainder of\nthe record blank.\nCharacter (s)\nItem\nGACI, MEDList, MED-X, MATILDA, and MATILDA Tract Extract all\ncontain the following items:\n1 - 2\n1. 1970 State Code\n3 - 4\n2. 1960 State Code\n5 - 7\n3. Federal Standard County Code\n8 - 10\n4. County of Tabulation Code\n11\n5. Central County Code\n6. Minor Civil Division or Census County Division Code\n12 - 14\n15 - 18\n7. Place Code\n19\n8. Place Description Code\n9. Size of Place Code (Sometimes blank in GACI which was\n20 - 21\nprepared prior to tabulation of the 1970 census\npopulation counts in some instances.)\n22\n10. Standard Consolidated Area Code\n11. Standard Metropolitan Statistical Area Code\n23 - 26\n27 - 30\n12. Urbanized Area Code\n31 - 34\n13. Tracted Area Code\n14. Universal Area Code Prefix\n35\n36 - 40\n15. Universal Area Code\n16. State Economic Area Code\n41 - 42\n43 - 45\n17. Economic Sub-Ragion Code\n18. Central Business District Code (Blank in GACI)\n46\n19. Area Name\n47 - 76\nNARA Reference Copy\nas\n-8-\nCharacter (s)\nItem\nGACI contains the preceding 19 items only, plus 8 characters\nof padding at the end of the logical record; MEDList, MED-X,\nMATILDA, and MATILDA Tract Extract all contain the following\nitems in addition.\n77 - 80\n20. Basic Tract Code\n21. Tract Suffix Code\n81 - 82\n22. Blockgroup Code (Not relevant in MATILDA or MATILDA\n83\nTract Extract) *\n23. Enumeration District Code (Not relevant in MATILDA or\n84 - 87\nMATILDA Tract Extract) *\n24. Enumeration District Suffix Code (Not relevant in\n88\nMATILDA or MATILDA Tract Extract) *\n25. Urban/Rural Classification Code\n89\n26. Ward Code (ED records only)\n90 - 91\n27. Congressional District Code\n92 - 93\n28. Housing Count\n94 -100\n29. Population Count\n101 -108\nMEDList contains the preceding 29 items only; MED-X, MATILDA,\nand MATILDA Tract Extract contain the following items in\naddition.\n30. Longitude (expressed in degrees and decimal equivalents\n109 -118\nof minutes and seconds as follows: 3 leading zeroes,\n3 places for degrees, and 4 decimals)\n31. Latitude (expressed in degrees and decimal equivalents\n119 -128\nof minutes and seconds as follows: 4 leading zeroes,\n2 places for degrees, and 4 decimals)\nBlank\n129 -132\nThe geographic codes and area names carried on the MATILDA and MATILDA Tract\nExtract records summarized from ED's and blockgroups are as taken from the\nfirst ED or blockgroup summarized. Honce, some codes are not applicable at\nall to the summary records, for example, ED and blockgroup codes. Other codes\nmay not be entirely applicable in cases where summary records are split across\nurban/rural, congressional district, or other boundaries for which there are\ncodes in the files.\nNARA Reference Copy\nNARA Reference Copy\n70\nFED\nSEA/\nST\nCTY\nMCD Place\nSMSA\nUA\nTA\nUAC\nESR CBD\nArea Name\nTract BG RD U/R 8 Housing Population Longitude Istitude\nI\n1\nI\nI\nI\n1\n,\nI\n1\n1\nI\n1\n11\n1111\n11.\n09150010011100\n1100\nA005 TROMBULL TCWN\n1160210025 ACC517RUNHULL TU.V.\n0901\n90\n1\n09160210011133\n7\n1100\n7\n116011601160210C05\nAJ051TRUMBULL\nTOWN\n0902 1\n0\n09160010011100\n7\n116011601160210005\nACC51TRUNTULL\nTOWN\n0903 1\n0\n7\n116011601166215005\nACC51780490LL\nTOWN\n0904 1\n0\n7\n116011601160216335\nACOSITHUMAOLL TOWN\n0905 1\n0\n09150010011100\n7\n116011801160210005\nACCSLTRUMBULE TOWN\n0906 1\n0\n0907\n90\n1\n050000897000035340000732038C000412811\n09160010011100\n7\n1100\n1160216005 AGG51TRUMBULL TOWN\n00000000000000000000119100006612000\n09160010011105\nA005 WESTON TOWN\n091000100111050820503\n216086 AC05 GEORGETOWN (U)\n5760216096 ACCSIGEURGETCWN (U)\n0551\n0858\n1\n091500100111050820503\n09160010011105\n7\n5760216086 ACOSIREMAINDER OF MCD (OR CCO)\n0551\n0859\n1\n0400010310000351300007338110C00412335\n5760216086 ADOSIRENAINDER OF MCD (OR CCD)\n0552\n0862\n1\n7\nACCS WESTPORT TOWN\n00084850002741400303000000000000000\n29100010011110\n5760\n570057065700210004 ACC51WESTPURT TOWN\n0501\n2649\n0\n04000121300003936000C7337553000411539\n09150010511113\n7\n09100010011110\n7\n57eC57605700210069\nACG51WESTPORT\nTOWN\n0502\n1\no\n0400013730000404500007335650000411522\n5760216069\nA0051WESTPORT TOWN\n0503\n1*\n1\n09160010011110\n7\n5763\n09160010011110\n7\n576057605700216009 AGOSINESTPORT TOWN\n0504\n0882\n0\n040000898000027290C007338230C03410929\n576C5760576C216069\nACC51WESTPURT\nTChN\n0505 1\n0\nC400015820000487000007335660000411212\n09162010011110\n7\n5760210009 AU051mESTPORT TOWN\n0506\n0881\n1\n0400010210000323100007332140000411294\n09160010711110\n7\n5760\n09160010011115\n5760\nACCS WILTON TOWN\n091600100111150820503\n5760\n216070 4005 GEORGETOWN (U)\n5760216C7C ACOSIGFORGETCAN (U)\n0451\n0853\n1\n0400003050000094700007343170000412459\n091000100111150820503\n5700\n09150010011115\n5760216070 ACOSIREMAINDER OF MCD (OR CCDI\n0451\n0855-1\n7\n5700\n5700\n576021607C ACC518EMAINDEN OF MCD (OR CCD)\n0452\n2078C1\n0400006390000193920027343100003411999\nC9160010011115\n7\n576057605160216073\nACOSIREMAINDER\nOF\nMCD\n(OR\nCCD)\nC453\n2679C5\n09160010011115\n7\n09160010011115\n7\n5760\n5760216070 ACCSIREMSINOEN OF MCD (OR CCDI\n0454\n268CC1\n09160030031\ncrcs HARTFORD\n00024740000935200000000060000000000\n04160030031005\n3280\nCOC4 AVUN TUWN\n05150030031005\n7\n3280\n3280216020\nCOSTAVON TOWN\n4621\n0110 1\n0600011760000408100097249270030417875\n326021002C\nCOC41AVOR TOWN\n4622\n0102 1\nE962198000255822000012230000862100099\n1\n3280\n09160030031010\n344,\nCO04 BERLIN TOWN\n00043830001414900000000000000000000\nOCCA18ENLIN TOWN\n4001\n0158 0\n0600017480009547800307284470000416271\n09160030051010\n7\n544049605440210040\nDisplay Example IV.A. Tape Themp of MATTIDA Connecticut, Pairfield and Hartford Co. Parts\n04155033331010\n7\n544049605440210040\nCOC418ERLIN TUnN\n4002\n0159 0\n0600007470000244900007275746003415796\n5440216040\nCC0413EKLIN TOWN\n4003\n0163\n1\n06000188800062220000727378C330416325\n09180030031010\n1\n544C\nC4160030031015\n3200\nCOO4 HLOOMFIELD TOWN\n00053810001830100000000000000000003\nC9160C30C31C15\n32d032803280215C16\nCCCSIBLOUMFTELD TOWN\n4711\n1\n0\n010001148C000407100007269210000418157\n7\n3290\n3280216016\nCCOSIBLOUNFTELD TOWN\n4712 1*\n1\nC100010820000364100007270710000418199\n64160030331015\n7\n328C328C3280215016 COC4IBLOONFIELD TCWN\n4713\n1\n0\nC9153030631015\n7\nC9150030031015\n3230216016\nTUWN\n4714\n0062\n1\n0100010780000385400007278180300418441\n7\n3230\n09150030031015\n7\n3200\n3280216016 CCO41BL0OMFIELD TOWN\n4715\n0060\n1\n010000392C0001219C000727129C000418526\nC004 BRISTOL TOWN\n00175550005548700000000000000000000\n05150030030020\n1170\n091c03300300200236311 1170\n316C96 CCC4 BRISTOL\n00175550005548700000000000000000000\n-14-\nB.\nCodes, Definitions, and Explanations\n1.\n1970 State Code - A two-digit numeric code assigned to the states alpha-\nbetically. The codes used are those defined in Federal Information Pro-\ncessing Standard Publications (FIPS PUBS) 5-1 and 6-1. See list of codes\nbelow.\n2.\n1960 State Code - A two-digit numeric code assigned by geographical divi-\nsions. The first digit indicates the division in which the state is located\nand the second digit indicates the state. See list of codes below.\n1970 Federal Standard State Codes and 1960 Census State Codes\nState\n1970\n1960\nState\n1970\n1960\n01\n63\nMontana\n30\n81\nAlabama\n02\n94\nNebraska\n31\n46\nAlaska\nArizona\n04\n86\nNevada\n32\n88\nArkansas\n05\n71\nNew Hampshire\n33\n12\nNew Jersey\n34\n22\nCalifornia\n06\n93\nColorado\n08\n84\nNew Mexico\n35\n85\nConnecticut\n09\n16\nNew York\n36\n21\nDelaware\n51\nNorth Carolina\n37\n56\n10\nDistrict of Columbia\n11\n53\nNorth Dakota\n38\n44\nFlorida\n12\n59\nOhio\n39\n31\nGeorgia\n13\n58\nOklahoma\n40\n73\nHawaii\n15\n95\nOregon\n41\n92\n23\nIdaho\n16\n82\nPennsylvania\n42\nIllinois\n17\n33\nRhode Island\n44\n15\nIndiana\n18\n32\nSouth Carolina\n45\n57\nIowa\n42\nSouth Dakota\n46\n45\n19\n20\n47\nTennessee\n47\n62\nKansas\nKentucky\n21\n61\nTexas\n48\n74\nLouisiana\n22\n72\nUtah\n49\n87\n23\n11\nVermont\n50\n13\nMaine\nMaryland\n24\n52\nVirginia\n51\n54\nMassachusetts\n25\n14\nWashington\n53\n91\nMichigan\n26\n34\nWast Virginia\n54\n55\n27\n41\nWisconsin\n55\n35\nMinnesota\nMississippi\n28\n64\nWyoming\n56\n83\nMissouri\n29\n43\n3. Federal Standard County Code - A three-digit numeric code assigned alpha-\nto counties within state. The codes used are those defined in FIPS PUB 6-1.\n4. County of Tabulation Code - A three-digit numeric code which usually agrees\nwith the Federal Standard County Code, unless the record was assigned an\nincorrect Federal County Code. In this case, the County of Tabulation Code\nrepresents a correction which should be followed in the aggregation of records.\n5. Central County Code - A one-digit numeric code identifying counties that\ncontain central cities of Standard Metropolitan Statistical Areas (SMSA's) 8\n0 - Yes and 1 or No.\nNARA Reference Copy\n-15-\n6. Minor Civil Division (MCD) or Census County Division (CCD) Code - A three-\ndigit numeric code identifying a township or equivalent area, including\ncensus county divisions, assigned alphabetically within county. The codes\nare not consecutive, gaps are provided for use in adding now units.\n7. Place Code - A four-digit numeric code identifying \"place\" as defined by\nthe Bureau of the Census, assigned alphabetically to places within state,\nGaps are provided.\n8. place Description Code - A one-digit numeric code identifying places by\ntype. The codes include: 1 = Central city of an SMSA only, 2 = Central\ncity of an urbanized area only, 3 = Central city of both an SMSA and an\nurbanized area, 4 = other incorporated place, 5 = unincorporated place,\nand 7 - not a place (applies to MCD remainders).\n9. Size of place Code - A two-digit code identifying places by the size group\n(16 groups) into which they fall on the basis of the 1970 population count.\nThe size codes are:\n00 = under 200 population\n08 = 10,000 to 19,999\n01 = 200 to 499\n09 = 20,000 to 24,999\n02 = 500 to 999\n10 = 25,000 to 49,999\n03 = 1,000 to 1,499\n11 = 50,000 to 99,999\n04 = 1,500 to 1,999\n12 = 100,000 to 249,999\n05 = 2,000 to 2,499\n13 = 250,000 to 499,999\n06 = 2,500 to 4,999\n14 = 500,000 to 999,999\n07 = 5,000 to 9,999\n15 = 1,000,000 or more population\n10. Standard Consolidated Area Code - A one-digit alphabetic code identifying\nmetropolitan complexes around some of the Nation's largest cities, which\ncomprise several contiguous SMSA's and additional counties that do not meet\nthe formal integration criteria for SMSA's but do have other strong rela-\ntionships. The two SCA's identified to date are the New York-Northeastern\nNew Jersey SCA (code A) and the Chicago-Northwestern Indiana SCA (code B).\n11. Standard Metropolitan Statistical Area Code - A four-digit numeric code\nassigned to SMSA's alphabetically within the U.S. An SMSA is a county or\ngroup of counties containing at least one city of 50,000 or more population,\nplus any adjacent counties which are metropolitan in character and eco-\nnomically and socially integrated with the central county or counties. In\nNew England the unit is a town rather than a county. One or more central\ncities are identified for each SMSA. SMSA boundaries may cross state lines.\nThe codes used are those defined in FIPS PUB 8.\n12. Urbanized Area Code - A four-digit numeric code identifying urbanized areas\nwithin the U.S. An urbanized area is a city (or twin cities) of 50,000 or\nmore population (central city) plus the surrounding densely settled incor-\nporated and unincorporated areas which meet certain criteria of population\nstatistics or density. UA'S differ from SMSA's chiefly in excluding the\nrural portions of counties composing the SMSA's and excluding those places\nseparated by rural territory from the densely populated fringe around the\ncentral city.\n13. Tracted Area Code - A four-digit numeric code identifying tracted areas\nwithin the U.S. Tracted areas are usually SMSA's but may also include\nadjacent areas (non-SMSA cities and counties)\nNARA Reference Copy\n-16-\n14. Universal Area Prefix Code - A one-digit numeric code indicating the level\nof a versal Area code. The levels are: 1 If County, 2 - New England Town,\n3 = City, and 4 = Central Business District.\n15. Universal Area Code - A five-digit numeric code assigned within the U.S. to\nall central citics of SMSA's and to the central business districts of all\ncities of 100,000 or more population, all places of 20,000 and over, to\ncounty remainders, and to all other counties.\n16. State Economic Area Code - A two-digit numeric code or a one-digit alphabetic\ncode assigned within state to single counties or groups of counties which\nare relatively homogeneous with respect to economic and social characteristics.\n17. Economic Sub-Region Code - A three-digit numeric code assigned within the\nU.S. to combinations of the 509 state economic areas, each grouping bringing\ntogether those SEA's which are more closely related in terms of their eco-\nnomic and social characteristics. ESR boundaries frequently cross state lines.\n18. Central Business District Code - A. one-digit numeric code indicating which\nED's and blockgroups are to be tabulated as part of a CBD: 0 = Yes and 1 -\nNo. Only used for cities of 100,000 or more population.\n19. Area Name - 30 characters provided for alphabetic spelling of state, county,\nMCD (or CCD), or place name.\n20-21. Tract Code (Basic and Suffix) - A six-digit numeric code assigned within county\nto census tracts as defined for the 1970 census. The first four digits\nidentify the \"basic\" tract, while the final two identify a subdivision into\ntwo or more tracts of what was originally a single tract (e.g., in 1960).\nThere is an implied period or hyphen between the fourth and fifth digits.\nBureau of the Census publications and maps eliminate the fifth and sixth\ndigits if they are both zeroes. The tract code is always unique within\ncounty (as noted), usually unique within SMSA, and, in a few instances,\nunique within state.\n22. Blockgroup Code - A one-digit numeric code assigned within tract to combina-\ntions of contiguous blocks having a combined average population of about\n1,000. On the Census Metropolitan Maps, the first digit of the three-digit\nblock-number indicates the blockgroup code. Used only in those areas covered\nby an Address Coding Guide.\n23-24. Enumeration District Code (Basic and Suffix) - A four-digit numeric basic\ncode plus a one-digit alphabetic suffix code (where applicable) assigned to\nED's within county. The suffix code is used to indicate parts of ED's split\nby area boundaries such as congressional district or split for administrative\nconvenience in taking the census.\n25. Urban/Rural Classification Code - A one-digit numeric code classifying ED's\nand blockgroups as urban, rural, or a combination of these: 0 - urban,\n1 a rural, and 2 = mixed.\n26. Ward Code - A two-digit code given to political subdivisions of a city used\nfor voting and administrative purposes. Appears only on ED records.\n27. Congressional District Code - A two-digit numeric code identifying congres-\nsional districts as designated by state legislatures, except that zero is\nused to precede one-digit numbers and 01 is used to identify areas in which\nmembers of Congress are elected at large rather than by district.\nNARA Reference Copy\n-17-\n28. Housing count - Count of all housing units, occupied and vacant, for the\narea designated by the codes. Seven characters are provided for this\ncount.\n29. Population Count - Count of all persons for the area designated by the\ncodes. Eight characters are provided for this count.\n30. Longitude - Longitude of the population midpoint of the area designated by\nthe codes (average longitude for MATILDA and MATILDA Tract Extract records\nsummarized from ED's and blockgroups). Note that longitude is not shown\nfor ED's with both zero population and housing. (This does not affect the\naverage longitude for MATILDA and MATILDA Tract Extract records.)\nLongitude is expressed in degrees and decimal equivalents of minutes and\nseconds as follows: three leading zeroes, three places for degrees, and\nfour decimals. See Table of Minutes and Seconds to Decimal Parts of a\nDegree on the next page.\n31. Latitude - Latitude of the population midpoint of the area designated by\nthe codes (average latitude for MATILDA and MATILDA Tract Extract records\nsummarized from ED's and blockgroups). Note that latitude is not shown\nfor ED's with both zero population and housing. (This does not affect the\naverage latitude for MATILDA and MATILDA Tract Extract records.)\nLatitude is expressed in degrees and decimal equivalents of minutes and\nseconds as follows: four leading zeroes, two places for degrees, and four\ndecimals. See Table of Minutes and Seconds to Decimal Parts of a Degree\non the next page.\nFor further definitions of geographic area concepts, consult the Census Users'\nDictionary, published as part of the 1970 Census Users' Guide, Part I (U.S.\nGovernment Printing Office: Washington, D.C., 1970).\nBlockgroups with both zero population and housing are not included in any of the\ngeographic tape files. ED's with zero population and housing, however, are shown.\nNote that for plotting the latitude and longitude coordinates on a map, the\nuser must know the map projection being used. A FORTRAN routine for converting\nto Mercator or other projections is available. For further information, contact\nthe Naval Oceanographic Office in Suitland, Md.\nFor converting coordinates into miles, one degree of latitude is equal to 60\nnautical miles (69 statute miles) , one degree of longitude is a function of the\ncosine of the latitude. For further information, contact the Geography Division\nof the U.S. Bureau of the Census.\nNARA Reference Copy"
}