TY  - BOOK
AU  - Narayanan, Rao  .
AU  - Datta,Amal  .
TI  - Waste water treatment / 
SN  - 81-204-0215-4
U1  - 628.3 
PY  - 1987///
CY  - New Delhi : 
PB  - Oxford & IBH Publishing company , 
ER  -