TY  - BOOK
AU  - Gardner,Martin
TI  - Sixth book of mathematical games from Scientific American
SN  - 0716709449
PY  - 1971///
CY  - San Francisco
PB  - W. H. Freeman
KW  - Mathematical recreations
N1  - The fifth collection was published under title: The unexpected hanging and other mathematical diversions; Includes bibliographical references
ER  -