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Birch’s Views of Philadelphia, 1800
Map of Historic Dock Creek
Last gasp of the Schuylkill Interceptor, December 20, 1956
Ground Plan, Great Central Sanitary Fair, Philadelphia
The Water Supply Problem of Philadelphia, 1899
Fairmount Water Works from the forebay, 1833
Fairmount Water Works and the Schuylkill River, 1838
Fourth of July, Centre Square, ca. 1812
Wooden Water Pipe, removed from Market Street, December 6, 1901
Yellow Fever in Philadelphia, 1793
“Town street scavengers from life,” Kollner, 1844
Southeast Corner of Third and Market, Philadelphia
London after the Great Fire, 1666
Treaty of Penn with Indians
Images from “A Day in the Ma’sh” by Maurice F. Egan, Scribner’s Monthly, July 1881
Volume of Sludge from 1,000,000 Gallons of Sewage
Diagram Showing Rate Between Bulk of Wet Sludge and Its Percentage Moisture
Sludge Drying Beds, Essen Nord, Germany
Grit Chamber, Essen, Germany
Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder
Sludge Presses for Grease Recovery, Bradford, England
Drain water from sludges obtained from sedimentation, septic and Emscher tanks
Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913
Thomas Run sewer outlet at Cobbs Creek
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