TY  - BOOK
AU  - Zickefoose,Chuck
ED  - United States.
TI  - Anaerobic sludge digestion: operations manual 
PY  - 1976///
CY  - Washington
PB  - Office of Water Program Operations, U.S. Environmental Protection Agency
KW  - Sewage disposal
KW  - Sewage
KW  - Purification
ER  -