Jeff O'Hare

Jeff O'Hare is the author of books such as Mathmania.

Books by Jeff O'Hare

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Mathmania

Puzzlemania Math Mathmania

Puzzlemania Math Mathmania

Yu-Gi-Oh

Yu-Gi-Oh

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Puzzlemania + Math = Mathmania, Got Finished Early

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Mathmania, Book 8

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Blitzkrieg

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The Big Book Of Puzzle Fun

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Mathmania=Puzzlemania + Math

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King Of Crime