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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

by United States. Congress. Senate. Committee on the District of Columbia