Outline Map of the County and City of Philadelphia and Vicinity, 1883
Philadelphia the Manufacturing and Industrial Capital map, 1906
“Philadelphia Underground,” Jan. 29, 1961
“Sewer Crawlers,” January 29, 1961
1779 Revolutionary War-era map of Philadelphia and environs
Schuylkill River Hydrographical Survey 1861-66 by H. P. M. Birkinbine
The Journey of Your Flush
Centennial Exhibition situation plan, 1876
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
Captain Sewer and Michael Nutter, 1998
