TY  - BOOK
AU  - Gray,N.F.
TI  - Biology of wastewater treatment
SN  - 0198590148 
PY  - 1989///
CY  - Oxford [England], New York
PB  - Oxford University Press
KW  - Sewage
KW  - Purification
KW  - Biological treatment
KW  - Sewage disposal
KW  - Biotechnology
ER  -