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The Usborne Book of Puzzle Adventures Three Adventure Stories with Puzzles to Solve: The Incredible Dinosaur Expedition, The Intergalactic Bus Trip, Time Train to Ancient Rome: Waters, G.: 9780746001554: Amazon.com: Books
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The Puzzling Adventures of Dr. Ecco (Dover Recreational Math) by Shasha, Dennis (1997) Paperback: Amazon.com: Books
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