TY  - BOOK
AU  - Asthana, D. K.
AU  - Asthana, Meera.
TI  - A textbook of environmental studies/by
SN  - 9788121927642
U1  - 333.707  
PY  - 2006///
CY  - New Delhi : 
PB  -  S. Chand & Company Ltd., 
KW  - Environmental sciences
KW  - Ecology
ER  -