TY  - BOOK
AU  - L A Graham
TI  - Ingenious mathematical problems and methods
SN  - 486205452
U1  - 510 G7398i 
PY  - 1959///]
CY  - New York
PB  - Dover Publications 
KW  -  Mathematical recreations
KW  -  Mathematics
KW  - Problems, exercises, etc
KW  - Jeux mathématiques
ER  -