Letter from Robie S. Lange to Harry S. Truman Presidential Library Staff, with Attached Drawings

The drawings attached to this letter are architectural and engineering drawings of McDonald Ranch at Trinity Site. The ranch house served as the site of the final assembly of the plutonium core for the world's first atomic bomb, detonated at Trinity Site in Los Alamos, New Mex...

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CHC nice United States Department of the Interior MHDC NATIONAL PARK SERVICE Morch 3 1849 WASHINGTON, D.C. 20240 IN REPLY REFER TO: HABS/HAER(429) March 1, 1984 Reference Staff Harry S. Truman Library Independence, Missouri 64050 Dear Sir: I wish to acknowledge receipt of those items I requested copied from the Lansing Lamont Papers. I very much enjoyed my visit of February 3 and wish to thank you for your assistance. The material sent has provided important insight into the precise events at the McDonald Ranch leading up to the first atomic test at Trinity Site. I want to take this opportunity to send you a reduced copy of the measured drawings prepared as part of this project. Please feel free to circulate them to anyone interested in the Manhattan Project. Eventually the original drawings will join the rest of the HABS/HAER Collection at the Library of Congress. Once more, thank you for your assistance Sincerely, Robie S.Large Robie S. Lange DARCOM Project Manager Historic American Buildings Survey/ Historic American Engineering Record National Park Service Enclosure MAR 5 1984 TANAA <s

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