TY  - GEN
AU  - Hammer , Mark J.
AU  - Hammer , Mark J.
TI  - Water and wastewater technology
SN  - 8120321081
U1  - 628.162 
PY  - 2002///
CY  - New Delhi
PB  - Prentice hall 
KW  - WATER
KW  - WASTEWATER
ER  -