The GCHQ Puzzle Book: Perfect for anyone who likes a good headscratcher
(9780718185541 / 45694360) - GCHQ - Puzzles & quizzes - UK ed. - Michael Joseph Ltd - London, United Kingdom - Penguin Books Ltd - In Print - Country of publication: UNITED KINGDOM - Dimensions: 234 x 153 x 28 mm | Modular production of customized