Mental Gymnastics: Recreational Mathematics Puzzles
by Dick Hess
ISBN 13: 9780486480541
Format: Paperback (160 pages) Publisher: Dover Publications Inc. Published: 16 Jun 2011
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The Population Explosion and Other Mathematical Puzzles
ISBN 13: 9789814740975
Format: Hardcover (150 pages) Publisher: World Scientific Publishing Company Published: 15 May 2016