Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)
Wissahickon Pipe Aqueduct, Roxborough to Mt. Airy, 1868
Plan of Philadelphia, John Hills, 1796
Wingohocking Sewer across Penn St.
Queen Lane Pumping Station, proposed design
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
The Water Supply Problem of Philadelphia, 1899
