TY  - BOOK
AU  - Asthana, D.K. .
TI  - A Textbook of Environmental Studies
U1  - 574.522 
PY  - 2006///
CY  - Delhi
PB  - S. Chand & Co.
KW  - Biology
KW  - G-Biology
KW  - Dept-Botany
ER  -