Friedhoffer, Robert, Magic and Perception. (ID-7768)

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Friedhoffer, Robert, Magic Tricks, Science Facts. (ID-7770)

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Friedhoffer, Robert, Magnetism and Electricity: Book 6. (ID-7771)

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Friedhoffer, Robert, Matter and Energy: Book 1. (ID-7772)

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Friedhoffer, Robert, More Magic Tricks, Science Facts. (ID-7773)

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