An edition of The Ultra secret
(1975)
The Ultra secret
by Frederick William Winterbotham
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Last edited by LeadSongDog
March 30, 2017 | History
Operation Ultra was designed to intercept & decode German signals sent using Enigma, the top-secret German cypher machine. F.W. Winterbotham, was the man responsible for the organization, distribution & security of Ultra. This is his personal account of the operation.
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AP 02
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- Created May 5, 2010
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| March 30, 2017 | Edited by LeadSongDog | Edited without comment. |
| January 10, 2015 | Edited by Jessamyn West | merge authors |
| August 12, 2011 | Edited by ImportBot | add ia_box_id to scanned books |
| September 3, 2010 | Edited by ImportBot | Added new cover |
| May 5, 2010 | Created by ImportBot | Imported from Internet Archive item record. |