TY  - BOOK
AU  - Asthana, D. K
TI  - Textbook of Environmental Studies
SN  - 9788121927642
U1  - 333.7 AST 
PY  - 2006///
CY  - New Delhi
PB  -  : S Chand, 
KW  -  Economics
KW  - Economics of land & energy
KW  - Energy Resource
KW  - Bio Diversity
KW  - D K Asthana; Meera Asthana
KW  - and Textbook of environmental studies
ER  -