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Birch’s Views of Philadelphia, 1800
Diagram from sewage treatment plan for Philadelphia, 1912
Gritty and the Phanatic in Ida’s Floodwaters
Dauphin and Sydenham car crash, Jan. 17, 1978
Fairmount Water Works from the forebay, 1833
Fourth of July, Centre Square, ca. 1812
Second Bank of Pennsylvania, South Second Street, Philadelphia
Wooden Water Pipe, removed from Market Street, December 6, 1901
“Town street scavengers from life,” Kollner, 1844
Southeast Corner of Third and Market, Philadelphia
Emscher Tank Installation at Essen Nord, Germany
View from front of 322 S. 44th, April 18, 1914
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
Thomas Run sewer outlet during construction
Delaware River at Arch Street from the New Jersey side, 1914
Cohocksink Sewer System outlet at Laurel Street
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