Wissahickon Pipe Aqueduct, Roxborough to Mt. Airy, 1868
Plan of Philadelphia, John Hills, 1796
Wingohocking Sewer across Penn St.
Diagram from sewage treatment plan for Philadelphia, 1912
Queen Lane Pumping Station, proposed design
Listening for leaks
Southwest Sewage Treatment Plant under construction, 1949
Photos from the Philadelphia Anglers’ Club
Two Frankford Creek Bridges, 1896-1899
Centre Square Water Works, Drawings of Intake Basin