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Philadelphia Water Department
PWD Drinking Water Treatment diagram
“Speeding the Parting Guest,” Feb. 25, 1909
“A Decidedly Mixed Drink,” April 6, 1899
Belmont Filters construction, 1903
Finished Upper Roxborough filters, 1903
Upper Roxborough filter beds under construction, July 1902
A.C. Abbott, MD
Water Before and After Roxborough
Upper Roxborough Filter Beds Complete, 1903