Cresheim Aqueduct
Drainage area plan, early 19th century
Schuylkill Navigation lock at Fairmount (Picturesque America)
Scenes on the Wissahickon Creek (Picturesque America)
Wissahickon Creek near the Paper Mill Bridge (Picturesque America)
Drive along the Wissahickon Creek Vallley (Picturesque America)
Mount Moriah Historic Cemetery and Arboretum
Sometimes the backside is the best side
Diagram from sewage treatment plan for Philadelphia, 1912
Early visions of Philadelphia’s airport