The Schuylkill Navigation: A Journey on the Historic Nineteenth Century Waterway
Birch’s Views of Philadelphia, 1800
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Bridge Street Draw, July 26, 1897
“Philadelphia Underground,” Jan. 29, 1961
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
Electric Pump Installations at Lardner’s Point Pumping Station
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
Lancaster/Schuylkill Bridge (Upper Ferry Bridge)
Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911
