Martin Gardner, The 2nd Scientific American Book of Mathematical Puzzles & Diversions (cover and excerpt), 1961. Published by Simon and Schuster; New York, NY. Image courtesy of the Reanimation Library.
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Martin Gardner, The 2nd Scientific American Book of Mathematical Puzzles & Diversions (cover and excerpt), 1961. Published by Simon and Schuster; New York, NY. Image courtesy of the Reanimation Library.