TY  - GEN
AU  - Gray, N. F.
TI  - Water technology: an introduction for scientists and engineers 
SN  - 0340676450 (pbk.)
U1  - 628.1 GRA 
PY  - 2001///
CY  - London, New York
PB  - Arnold, Wiley
KW  - Water quality management
KW  - Sewage disposal
KW  - Freshwater biology
KW  - Water quality biological assessment
ER  -