Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Three reports on Philadelphia’s Sewage Treatment Project, 1911-1914
The Sad History of Frankford Creek
Plan of Pine Street Sewer, 1830
Mill Creek Sewer under construction, 1883
Fairmount Water Works, W.H. Bartlett, 1839
Fairmount Water Works from the forebay, 1833
Fourth of July, Centre Square, ca. 1812
Centre Square Engine House, ca. 1807