Arch Street Ferry, Philadelphia
The City and Port of Philadelphia on the River Delaware from Kensington, 1800
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
30th Street Sewer
PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
Oak Lane Reservoir pipeline, 1904
Upper Roxborough filter beds under construction, July 1902
Portrait of Samuel H. Ashbridge, Mayor
Philadelphia Water Department chief engineer John Trautwine Jr., 1890s
