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
Perkiomen Water Supply Surveys, 1866
Map of the County of Philadelphia from Actual Survey, 1843
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
New Mill House at Fairmount