PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
Torresdale Conduit work gang, 12/18/1906
Bureau of Water, Cumberland, west of 13th Street, pipe line, 1907
State Street pipeline construction, 1904
Philadelphia Water Department chief engineer John Trautwine Jr., 1890s
Immigrant family, ca. 1900, nurse in black
Jar of raw sewage before treatment, 2000
City officials tour new interceptor sewer, 1953
Bingham Street Sewer, East of Tacony Creek, 1921