![DISCUSSION: PRESENT DAY WATER FILTRATION]()
DISCUSSION: PRESENT DAY WATER FILTRATIONGeorge A. Johnson, John H. Gregory, George C. Whipple, P. A. Maignen, W. C. Hawley, J. N. Chester, James M. Caird, J. W. Ellms, George W. Fuller, Charles B. Buerger, Theodore A. Leisen, Robert Spurr Weston, James W. Armstrong, John C. Trautwine, Jr., Robert E. Milligan, F. A. Dallyn, Paul Hansen, Charles B. Burdick, H. F. Dunham and H. C. Hodgkins · Journal (American Water Works Association) · 1914