Drainage area plan, early 19th century
Last gasp of the Schuylkill Interceptor, December 20, 1956
The Water Supply Problem of Philadelphia, 1899
Dauphin and Sydenham car crash, Jan. 17, 1978
Mill Creek Sewer under construction, 1883
“Town street scavengers from life,” Kollner, 1844
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
State Street pipeline construction, 1904
Belmont Filters construction, 1903