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  1. 1
    by Kahn, David, 1930-
    Published 1991
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    Seizing the enigma : the race to break the German U-boat codes, 1939-1943 /
  2. 2
    by Kahn, David, 1930-
    Published 1996
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    Seizing the enigma : the race to break the German u-boat codes, 1939-1943 /

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