TY  - BOOK
AU  - Birdie, G.S
AU  -  Birdie, J.S
TI  - Water supply and samitary eng. Including environmental eng. Water and air pollution acts
U1  - 628.1 BIR 011 
PY  - 2011///
CY  - New Delhi
PB  - Dhanpat rai
ER  -