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The Usborne Book of Young Puzzle Adventures: Lucy and the Sea Monster, Chocolate Island, Dragon in the Cupboard (Young Puzzles Adventures Series): Dolby, Karen, Church, Caroline Jayne: 9780746022900: Amazon.com: Books
Dennis Elliott Shasha - Article
The Puzzling Adventures of Dr.Ecco (..., Shasha, Dennis 9780486296159 | eBay
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Dr. Ecco: Mathematical Detective (Codes, Puzzles, and Conspiracy 9780486435527 | eBay
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School Grounds - #3 Tuesday - Puzzle Adventure - YouTube
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Dr. Ecco: Mathematical Detective by Dennis Shasha | eBook | Barnes & Noble®
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The Puzzling Adventures Of Dr. Ecco - (dover Recreational Math) By Dennis Shasha (paperback) : Target