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- from Ancient Times to the Internet (2nd ed.), New York: Scribner, ISBN 068-483130-9 Kozaczuk, Władysław (1999) [1967], Bitwa o Tajemnice: Służby wywiadowcze...58 KB (6,908 words) - 14:00, 11 March 2024
- Ancient Times to the Internet. Macmillan and Sons. pp. 743–751. ISBN 0684831309. quoted in Kahn, The Codebreakers, p. 744. Quoted in Erico Marui Guizzo...64 KB (6,007 words) - 07:11, 6 May 2024
- Communication from Ancient Times to the Internet, New York: Scribner, ISBN 0684831309 Lee, Bartholomew (2006), Radio Spies -- Episodes in the Ether Wars (PDF)...74 KB (9,455 words) - 00:21, 10 May 2024
- follow-up to 'Applied Cryptography'. Kahn, David — The Codebreakers ISBN 0684831309 The best available single volume source for cryptographic history, at