TY  - BOOK
AU  - Hopkins,Edward Scott.
AU  - Elwood L Bean
TI  - Water purification control 
U1  - 628.16 WAT 1966 
PY  - 1966///
CY  - America
PB  - The Waverly press,inc
KW  - Water
KW  - purification
N1  - including index; Type of water -- coagulation -- fluoridation
ER  -