TY  - GEN
AU  - Asthana, D. K.
TI  - A textbook of environmental studies
SN  - 9788121927642
U1  - 628 
PY  - 2006///
CY  - New Delhi
PB  - S. Chand & Company
KW  - Environmental studies
N1  - Includes references & indexes
ER  -