TY  - BOOK
AU  - Phondke,  Bal
AU  - Roy, Subhash 
TI  - When...questions to 50 interesting answers
T2  - Popular science 
SN  - 9788123755472
U1  - 502 
PY  - 2009///
CY  - New Delhi
PB  - National Book Trust
KW  - Science
KW  - Miscellanea
KW  - Question and answers
N1  - Includes bibliographical refernces
ER  -