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Philadelphia Water Department
Typhoid fever deaths, 1860-1936
Steam engine drawing, Frederick Graff Sr., 1815
1903 Proceedings of the Engineers’ Club title page
Lab tech, water cleaning demo, Philly Home Show, 1960
Bureau of Water Spring Garden Testing Station, 1901
Engine House of the Belmont Works
Laboratory Alkalinity test, ca. 1943
River herring from the Schuylkill
Plan for the Collection, Treatment and Disposal of Sewage, 1914
Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911