Colombini, Aldo, Throw in the Sponge. (ID-4782)

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Collier, L. C., Complete Two Ball Sponge Ball Routine. (ID-4678)

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Biro, Pete, Tomato Trick: A Long-Forgotten Classic, The. (ID-2941)

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Biro, Pete, Pete Biro’s Magic no. 3: BOWLing with the Stars. (ID-2929)

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Behnke, Leo, Magic City Library of Magic vol. 9: Sponge Balls. (ID-2560)

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