TY  - BOOK
AU  - Rao, P.Venugopala
TI  - Textbook of environmental engineering
SN  - 81-203-1930-3
U1  - 628 RAO 
PY  - 2004///
CY  - NEW DELHI
PB  - PRENTICE HALL OF INDIA
KW  - ENVIRONMENTAL ENGINEERING
ER  -