George J. Summers
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The Great Book of Mind Teasers & Mind Puzzlers
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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Logical Deduction Puzzles (Official Mensa Puzzle Book)
Summers, George J.
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Test Your Logic (Dover Recreational Math)
Summers, George J.
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New Puzzles In Logical Deduction
J, Summers George
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Juegos de Ingenio 2 (Los Mejores Pasatiempos de Cálculo e Ingenio)
George J. Summers
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