Gardner, Martin, 1914- The last recreations: hydras, eggs, and other mathematical mystifications/ Martin Gardner. - New York: Copernicus, c1997. - x, 392 p.: ill. (some col.); 24 cm. Includes index. ISBN: 0387949291 (hardcover : alk. paper) LCCN: 96051641 Subjects--Topical Terms: Mathematical recreations. Dewey Class. No.: 510