TY  - BOOK
AU  - Lal,D.
TI  - Water supply and waste water engineering
U1  - 628.162LAL 
PY  - 2011///
CY  - New Delhi
PB  - S.K Kataria
KW  - Sewage--Purification
KW  - Sewage--Purification--Biological treatment
KW  - Water reuse
UR  - http://www.amazon.com/exec/obidos/ASIN/chopaconline-20
ER  -