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  1. 1
    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 /

    Published 2008
    Subjects: “…Cryptographers United States Biography.…”
    Full Text (via De Gruyter)
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  2. 2
    The man who broke Purple : the life of Colonel William F. Friedman, who deciphered the Japanese code in World War II /

    The man who broke Purple : the life of Colonel William F. Friedman, who deciphered the Japanese code in World War II / by Clark, Ronald (Ronald William), 1916-1987

    Published 1977
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  3. 3
    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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  4. 4
    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
    Subjects:
    Full Text (via ProQuest)
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