TY  - BOOK
AU  - AstHona, D K
AU  - Asthona, M
TI  - Textbook of Environmental Studies
U1  - 333.7 
PY  - 2006///
CY  - Newdelhi
PB  - S Chand and co
KW  - ENVIRONMENTAL STUDIES (R)
N2  - Circulation Section
ER  -