TY  - BOOK
AU  - P. Venugopala Rao
AU  - ,
TI  - Principles of environmental science and engineering
SN  - 8120328930
U1  - 333 . 7  RAP 
PY  - 2006///
CY  - New Dehli
PB  - Prentice Hall of India
KW  - Environmental Science
N1  - ISD
ER  -