TY  - BOOK
AU  - Asthana, D. K.
AU  - Asthana, Meera
TI  - A textbook of environmental studies / 
SN  - 9788121927642
U1  - 363.7 AST 23
PY  - 2007///
CY  - New Delhi : 
PB  - S. Chand & Company
KW  - Environmental Science
N1  - Includes index
ER  -