Real Enigma Heroes
by Phil Shanahan
ISBN 13: 9780752457857
Format: Paperback (224 pages) Publisher: The History Press Published: 13 Aug 2010
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The Hut Six Story : Breaking the Enigma Codes
by Gordon Welchman
ISBN 13: 9780947712341
Format: Paperback (277 pages) Publisher: M.& M.Baldwin Published: 01 Dec 1997