George J. Summers
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Test Your Logic (Dover Recreational Math)
Summers, George J.
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The Great Book of Mind Teasers & Mind Puzzlers
Summers, George J.
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Logical Deduction Puzzles (Official Mensa Puzzle Book)
Summers, George J.
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Pocket Puzzlers: Brain Teasers
Gardner, Martin; Steinwachs, Robert; Summers, George J.; Harshman, Edward J.
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Juegos de ingenio 2. Los mejores enigmas y juegos de inteligencia. Nuevos y más divertidos problemas y pasatiempos de cálculo e ingenio.
George J. Summers
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Mind Teasers: Logic Puzzles and Games of Deduction
George J Summers
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