TY  - DATA
AU  - Asthana, D. K.
TI  - (A) Textbook of environmental studies
SN  - 81-219-2764-1:
U1  - 574.5 
PY  - 2012///
CY  - New Delhi
PB  - S. Chand
KW  - ECOLOGY
N1  - Includes glossary, bibliography and index
ER  -