1779908
9780850527476
This title covers the story from the early code-breaking efforts through the rickety structure of the pre-war Government Code and Cypher School to Bletchley Park where an organisation arose, unscrambling thousands of secret enemy messages every day.Freedman, Maurice is the author of 'Unraveling Enigma', published 2000 under ISBN 9780850527476 and ISBN 0850527473.
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