TY  - BOOK
AU  - Dhaliwal,G.S.,:Sangha,G.S. & Ralhan,P.K.
TI  - Fundamentals of environmental science
U1  - 363.7 D38F 
PY  - 1998///
CY  - Ludhiana
PB  - Kalyani
KW  - ECOLOGY
KW  - CONSERVATION OF NATIONAL RESOURCES
ER  -