TY  - BOOK
AU  - Santra, S C
TI  - Environmental science / 
SN  - 817381404x
U1  - 614.7 
PY  - 2001///
CY  - Calcutta
PB  - New Central Book Agency (P) Ltd., 
KW  - Biosphere
KW  - Environmental components
KW  - Environmental policy
ER  -