“Philadelphia Underground,” Jan. 29, 1961
1779 Revolutionary War-era map of Philadelphia and environs
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
Captain Sewer and Michael Nutter, 1998
30th Street Sewer
69th St. Sewer and Culvert across Lansdowne AVe.
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
Allegheny Avenue Sewer at Pier 126, 1918
Plan for the Collection, Treatment and Disposal of Sewage, 1914
Devereaux Street Sewer, Philadelphia magazine, 1911