Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Plan of Pine Street Sewer, 1830
Mill Creek Sewer under construction, 1883
Fairmount Water Works, W.H. Bartlett, 1839
Centre Square Engine House, ca. 1807
Dobson’s Mill, 1884, from History of Philadelphia by Scharf & Wescott
A Day in the Ma’sh – Oil Refinery
Perkiomen Water Supply Surveys, 1866