Mill Creek Sewer under construction, 1883
Emscher Tank Installation at Essen Nord, Germany
Drain water from sludges obtained from sedimentation, septic and Emscher tanks
“Philadelphia Underground,” Jan. 29, 1961
30th Street Sewer
State Street pipeline construction, 1904
Upper Roxborough filter beds under construction, July 1902
Rudolph Hering
Standard Philadelphia (B) Hydrant
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912