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Martin Gardner
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The Grapes of Math
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Mind Spark
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Robyn Arianrhod
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What is the Name of This Book...
Raymond M. Smullyan
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John Pazzelli
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Green Belt Kakuro: 150 Puzzles
Conceptis Puzzles
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Second-Degree White Belt...
Conceptis Puzzles
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Things to Make and Do in the...
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Brown Belt Kakuro
Conceptis Puzzles
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Bedtime Math: This Time It's...
Laura Overdeck,
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Julia E. Diggins,
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Kenken: Lim-Ops, No-Ops and...
Robert Fuhrer (Editor)
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Black Belt Kakuro: 150 Puzzles
Conceptis Puzzles
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Problem Solving Through...
Bonnie Averbach,
Orin Chein
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Mindome Ltd
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100 Great Problems of...
Heinrich Dorrie
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Byriah Loper
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The Lady or the Tiger?: And...
Raymond M Smullyan
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