Plan of Philadelphia, John Hills, 1796
Dauphin and Sydenham car crash, Jan. 17, 1978
Plan and profile of proposed Delaware Seventh St. Sewer, 1850
Map of the County of Philadelphia from Actual Survey, 1843
Philadelphia the Manufacturing and Industrial Capital map, 1906
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
Commencement of laying the main on the East side of the River, 1871
Allegheny Avenue Sewer at Pier 126, 1918
Pennypack Sewage Treatment Works, 1914
Sewer construction, Rock Run, 1922
