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  1. 1
    The codebreakers : the story of secret writing.

    The codebreakers : the story of secret writing. by Kahn, David, 1930-

    Published 1967
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  2. 2
    The reader of gentlemen's mail : Herbert O. Yardley and the birth of American codebreaking /

    The reader of gentlemen's mail : Herbert O. Yardley and the birth of American codebreaking / by Kahn, David, 1930-

    Published 2004
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