There are many documented sources of information regarding the Dayton code breaking effort. The most dramatic and detailed are at the National Archives at College Park, Maryland. However, some documents remain in the NCR Archive at Dayton History. And there is much research yet to be done. Below are links to documents available at this site.
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Nomination for Medal for Merit
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Desch Mumma 1973 interview for the Smithsonian Oral History Project
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Bombe correspondence
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The Electronic Chassis
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Thyratron Specs
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Wartime, pre- and post-war patents, and documents related to their filings
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1942 Research Report
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Vannevar Bush to Joseph Desch
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History of the Bombe Project, 1944
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Messages, between Dayton and Washington, 1942-1943
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1943, 1944 Rosters of Personnel at the U.S.N.C.M.L.
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NCR in 1938
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The 11 wartime Electrical Research columns in the NCR News
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NCR News: the 15 Jul 1943 Purple Heart Ceremony
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Regulations for the WAVES at Sugar Camp
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WAVES Recruiting booklet: The Story of You in Navy Blue
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Transcription of the Report written by Capt. Joseph N. Wenger, 30 May 1946: Review of Activities and Future Plans at the U.S. Naval Computing Machine Laboratory, Dayton Ohio.
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Transcription of pages 1 to 12 of the Report written by Capt. Ralph I. Meader to the Vice Chief, Naval Operations, January 1949, as part of a 14 day training duty
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Transcription of pages 13 to 20 of the Report written by Capt. Ralph I. Meader to the Vice Chief, Naval Operations, January 1949, as part of a 14 day training duty
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Transcription of pages 21 to 25 of the Report written by Capt. Ralph I. Meader to the Vice Chief, Naval Operations, January 1949, as part of a 14 day training duty
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Images of the Meader report
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Commendation for USNCM by J. N. Wenger, Jan. 1945
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Personnel Orders outlining numbers at the USNCML
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