TY  - BOOK
AU  - Venugopala Rao , P  .
TI  - Text book of enviromental engineering / 
SN  - 81-203-1930-3
U1  - 628.5 
PY  - 2000///
CY  - New Delhi : 
PB  - Prentice Hall of India Pvt Ltd. , 
ER  -