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  1. Top secret : a handbook of codes, ciphers, and secret writing /
    Top secret
    a handbook of codes ciphers and secret writing
    Book
    由 Janeczko, Paul B.
    出版 2004
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  2. Lapsit services for the very young II : a how-to-do-it manual /
    Lapsit services for the very young II
    a how-to-do-it manual
    Book
    由 Ernst, Linda L.
    出版 2001
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  3. Can you crack the code? : a fascinating history of ciphers and cryptography /
    Can you crack the code?
    a fascinating history of ciphers and cryptography
    Book
    由 Schwartz, Ella, 1974-
    出版 2019
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