Birch’s Views of Philadelphia, 1800
Early photographs of Fairmount and vicinity, 1848
Early visions of Philadelphia’s airport
Frankford Creek Watershed Historical Timeline
Drawing Dock Creek
The Manayunk Expressway
Sewers, Pollution, and Public Health in 19th Century Philadelphia
The Worry of the Wires
Visions of the Schuylkill, 1884 and Now