TY  - BOOK
AU  - Duddles, Glenn A.
AU  - Richardson, Stevens E.
TI  - Application of plastic media trickling filters for biological nitrification systems: by ... and Stevens E. Richardson
AV  - TD475 D8 
PY  - 1973///
CY  - Washington
PB  - U. S. Environmental Protection Agency
KW  - Water
KW  - Purification
KW  - Filtration
KW  - Biological treatment
ER  -