TY  - BOOK
AU  - Brecher, Erwin
AU  - Mike Gerrard
TI  - Challenging science puzzles
SN  - 9788172451110
U1  - CIR 500 B829 [c?]. 
PY  - 0000///[date of publication not identified]
CY  - New Delhi
PB  - Goodwill Publishing House
KW  - Science
KW  - Problems, exercises, etc
N1  - Includes index
ER  -