Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Pipeline being laid in Wissahickon Avenue
Dauphin and Sydenham car crash, Jan. 17, 1978
Still photo from a video sewer inspection, 2000
Plan and profile of proposed Delaware Seventh St. Sewer, 1850
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