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U.S.R.C. INTERIOR MEMORANDUM Jan 25, 1926. Date Mr. Roeder. Subject For Attention of Answering Memo. of Dear Mr Roeder: I am sending you herewith data relative to the radium loss of DR. P. H. Cook at Worcester, Mass. Also copy of data, etc. which I have prepared for Dr. Flinn. Yours, truly, H. H. Barker. States