TY  - BOOK
AU  - Ellms, Joseph W.
TI  - Water purification
U1  - 628.161 
PY  - 1928///
CY  - New York
PB  - McGraw Hill Book Company
KW  - Water Treatment
KW  - Drinking Water Quality
KW  - Reverse Osmosis
N1  - Includes bibliographical references and index
ER  -