TY  - BOOK
AU  - Niederman,Derrick
TI  - Hard-to-solve math puzzles
SN  - 9788172452926(pbk.)
U1  - 793.74 22
PY  - 0000///[20-?]
CY  - New Delhi
PB  - Goodwill Publishing House
KW  - Mathematical recreations
N1  - Includes  index
ER  -