Penrose Titles (1987-8), Time Travel (1925-8), Knotted Donuts (1799-8)

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Worth Publishers, Incorporated, 1989 - Mathematical recreations. - 3 pages

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About the author (1989)

Martin Gardner is the author of more than seventy books on a vast range of topics including "Did Adam & Eve Have Navels?", "Calculus Made Easy", & "The Annotated Alice". He lives in Hendersonville, North Carolina.

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