TY  - BOOK
TI  - Manual of instruction for sewage treatment plant operators 
U1  - 628.3 
PY  - 0000///n.p.
CY  - New York: 
PB  - Health Education Service 
KW  - Sewage disposal-Instruction
KW  - Water-Pollution
KW  - Municipal engineering
KW  - Public health education
ER  -