Wingohocking Sewer across Penn St.
Queen Lane Pumping Station, proposed design
Listening for leaks
Two Frankford Creek Bridges, 1896-1899
Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Pipeline being laid in Wissahickon Avenue
Pennsylvania Railroad Bridge at Manayunk, about 1895
Gritty and the Phanatic in Ida’s Floodwaters