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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 Eyes Closed In the Hall Mission Maths—a Board Game Problems, Challenges, Investigations Puzzle Tables and Wollygoggles In Germany Mathe mit geschlossenen Augen Review In Brazil For information on O’Brien’s Dutch and Australian publications, contact him at tobrien002@earthlink.net |
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