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GCHQ Puzzle Book II
E-bok,
2018,
Engelska,
ISBN 9780241365458
Train your brain with these fiendishly difficult puzzles, the perfect companion for anyone wanting to keep their mind busy'Fiendishly tricky' Daily MailWith their first bestselling …
GCHQ Puzzle Book
E-bok,
2016,
Engelska,
ISBN 9780718185558
Sharpen your mind to beat the smartest brains in Britain with the original official GCHQ puzzle bookWould GCHQ recruit you? Pit your wits against the people who cracked Enigma in …