Diagram from sewage treatment plan for Philadelphia, 1912
Southwest Sewage Treatment Plant under construction, 1949
Dauphin and Sydenham car crash, Jan. 17, 1978
Norman Lofton inspects sewer at Ditman and Sheffield, 1987
Emscher Tank Installation at Essen Nord, Germany
Drain water from sludges obtained from sedimentation, septic and Emscher tanks
Captain Sewer and Michael Nutter, 1998
Rudolph Hering
Typical house drainage