TY  - BOOK
AU  - Singh, Gurcharan
AU  - Singh, Jagdish
TI  - Water supply and sanitary engineering. (Envrionmental engineering) 
SN  - 8180140296
U1  - 628.1 
PY  - 2011///
CY  - Delhi
PB  - Standard Pubs. Distributors 
ER  -