


Roberts Mill, Wingohocking Creek, 1871

Last gasp of the Schuylkill Interceptor, December 20, 1956

Gritty and the Phanatic in Ida’s Floodwaters

Dauphin and Sydenham car crash, Jan. 17, 1978

Mill Creek Sewer under construction, 1883

Wooden Water Pipe, removed from Market Street, December 6, 1901

View from front of 322 S. 44th, April 18, 1914

Sludge Drying Beds, Essen Nord, Germany

Grit Chamber, Essen, Germany

Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder
