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Schuylkill River from below the South Street Bridge, 1873
Diagram from sewage treatment plan for Philadelphia, 1912
Mill Creek Sewer under construction, 1883
Emscher Tank Installation at Essen Nord, Germany
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
Bacteria in Delaware River, Torresdale Filters, 1913
Frankford Creek: Sad History of an Urban Stream title page
Bridge Street, intermediate pier, ca. 1896 [Detail]
Bridge Street Draw, intermediate pier, ca. 1896 [detail]
Bridge Street Draw, intermediate pier, ca. 1896
Bridge Street Draw, construction of piers, ca. 1896
Bridge Street Draw, Cofferdam, ca 1896 [Detail]
Bridge Street Draw, looking north, ca. 1896
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