TY  - BOOK
AU  - Asthana,D.K
TI  - Textbook of environmental studies for undergraduates courses
SN  - 9788121927642
U1  - 363.7 AST 
PY  - 2006///
CY  - New Delhi
PB  - S.Chand & Co. Pvt.Ltd.
KW  - environmental studies
ER  -