Manholes like this give access to city’s sewer system, 1961
Sewer Inspections: Vintage Images
Bill for Privy Cleaning, 1869
Half a Century of Clean Water: The Clean Water Act, 1972-2022
Emscher Tank Installation at Essen Nord, Germany
Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder
Drain water from sludges obtained from sedimentation, septic and Emscher tanks
“Philadelphia Underground,” Jan. 29, 1961
Captain Sewer and Michael Nutter, 1998
30th Street Sewer