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Books by Professor Tobbs Daily Tantalizers Books 1-5, Problem of the Day Daily Tantalizers Books 6-8, Problem of the Day Middle Grades VersaTiles® for Critical-Thinking VersaTiles® for Problem Solving In the UK Problems, Challenges, Investigations Puzzle Tables and Wollygoggles In Germany Mathe mit geschlossenen Augen In Brazil For information on O’Brien’s Dutch and Australian publications, contact him at tobrien001@earthlink.net
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