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Usborne Puzzle Adventures 18 : The Emerald Conspiracy
Mark Fowler ; ill. by Mark Burgess 1st ed.. Usborne, 1993 書
Usborne Superpuzzles : Codes & Ciphers
Mark Fowler ; ill. by Radhi Parekh 1st ed.. Usborne, 1994 書
Usborne Superpuzzles : Logic Puzzles
