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  • The GCHQ Puzzle Book by GCHQ
    The GCHQ Puzzle Book (English, Paperback) GCHQ

    Would GCHQ recruit you? Pit your wits against the people who cracked Enigma in the official puzzle book from Britain's secretive intelligence organisation . . . --------------------------------...

    $16.15 $19.95
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  • The GCHQ Puzzle Book II by GCHQ
    The GCHQ Puzzle Book II (English, Paperback) GCHQ

    Challenge yourself with the GCHQ team's long-awaited second puzzle book - full of both harder and easier brain teasers. ...

    $17.14
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