The Ultra secret / F. W. Winterbotham.
Operation Ultra was designed to intercept and decode German signals sent using Enigma, the top-secret German cypher machine. F.W. Winterbotham was responsible for the organization, distribution and security. This is his account of the operation.
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| Format: | Book |
| Language: | English |
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London :
Weidenfeld & Nicolson,
1999
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| Series: | Weidenfeld & Nicolson 50th Anniversary ;
1949-1999 |
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