Schuylkill River from below the South Street Bridge, 1873
Scenes on the Wissahickon Creek (Picturesque America)
You would not have wanted to drink it: Philadelphia’s water supply in 1884
Plans and maps of the Pennypack Creek Watershed in Philadelphia
Wingohocking Sewer across Penn St.
Philadelphia’s Sewer Problem
Sewer systems, City of Philadelphia, 1927 and 1929
Early visions of Philadelphia’s airport
Frankford Creek Watershed: A historical overview of the Philadelphia section
Frankford Creek Watershed Historical Timeline