Queen Lane Pumping Station, proposed design
Pipeline being laid in Wissahickon Avenue
Still photo from a video sewer inspection, 2000
Dobson’s Mill, 1884, from History of Philadelphia by Scharf & Wescott
Map of the County of Philadelphia from Actual Survey, 1843
Outline Map of the County and City of Philadelphia and Vicinity, 1883
Upper Roxborough filter beds under construction, July 1902
Charles Spencer & Co., Leicester Knitting Mills, Germantown, Philadelphia
Water Before and After Roxborough