TY  - BOOK
AU  - Dhaliwal, G.S.
AU  - Sangha, G.S. 
AU  - Ralhan, P.K. 
TI  - Fundamentals of environmental science
U1  - 628 DHA 
PY  - 1996///
CY  - New Delhi
PB  - Kalyani Publishers
N1  - BIB
ER  -