TY  - BOOK
ED  - Water Pollution Control Federation.
TI  - WPCF extended aeration skill training program - student workbook
PY  - 1980///?]
CY  - Washington, D.C.
PB  - The Federation
KW  - Sewage
KW  - Purification
KW  - Aeration
KW  - Problems, exercises, etc
ER  -