Gardner, Martin, Logic Machines and Diagrams. (ID-8194)

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Gardner, Martin, Logic Machines and Diagrams. (ID-8195)

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Gardner, Martin, Magic Numbers of Dr. Matrix, The. (ID-8198)

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Fulves, Karl, Calculator Tricks. (ID-7837)

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Frost, Ron, Effective Word and Number Routines. (ID-7791)

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