TY  - BOOK
AU  - Gardner, Martin
AU  - Ravielli, Anthony
TI  - Entertaining mathematical puzzles 
SN  - 978-0-486-25211-7
U1  - 793.74 G226 1961 
PY  - 1961///
CY  - New York : 
PB  - Dover Publications, Inc., 
KW  - Mathematical Recreations
ER  -