Title: Filtration of the water supply of the District of Columbia. Letter from the Acting Secretary of War, transmitting, in response to resolution of the Senate of January 10, 1898, a report from the Surgeon-General of the Army and Capt. D. D. Gaillard, Corps of Engineers, relative to the filtration of the water supply of the District of Columbia
Subjects: Water, Water-supply, Filters and filtration, Pollution