TY  - BOOK
AU  - Brecher, Erwin
AU  - Gerrard, Mike
TI  - Challenging science puzzles
SN  - 9788172451110
U1  - 793.73 BRE 
PY  - 2007///
CY  - New Delhi
PB  - Goodwill Publishing House
KW  - Puzzles
ER  -