-- Puzzle books full of thought provoking problems and brain teasers -- Clues at the end of each book help with the more difficult problems

Number Puzzles 1999, E.D.C. Publishing

ISBN-13: 9780881100501

Illustrated

Hardcover

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Number Puzzles 1980, E.D.C. Publishing

ISBN-13: 9780860204350

Trade paperback

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Number Puzzles 1980, HarperCollins Distribution Services

ISBN-13: 9780860204367

Hardcover

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