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Historic resources from our archives - images, maps, documents, and more.
Volume of Sludge from 1,000,000 Gallons of Sewage
Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder
Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913
Bacteria in Delaware River, Torresdale Filters, 1913
Plan for the Collection, Treatment and Disposal of Sewage, 1914