“Philadelphia Underground,” Jan. 29, 1961
Centennial Exhibition situation plan, 1876
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
Bureau of Water Spring Garden Testing Station, 1901
Electric Pump Installations at Lardner’s Point Pumping Station
Philadelphia Water Department Fire Hydrant
Diagram showing the daily pumpage for the year 1877
