Sewer worker Anthony Holston enters sewer, 1990
Manholes like this give access to city’s sewer system, 1961
Sewer Inspections: Vintage Images
Thomas Run sewer outlet at Cobbs Creek
Thomas Run sewer outlet during construction
“Philadelphia Underground,” Jan. 29, 1961
“Sewer Crawlers,” January 29, 1961
1779 Revolutionary War-era map of Philadelphia and environs
The Journey of Your Flush
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia