TY  - BOOK
AU  - Manual of instruction for water, x
AU  - x
TI  - Manual of instruction for water treatment plant operators: x
SN  - x
U1  - 614/MAN 
PY  - 0000///19,,,
CY  - N. Y
PB  - Health Education Service
KW  - Environment
KW  - Public Health
ER  -