Diagram Showing Rate Between Bulk of Wet Sludge and Its Percentage Moisture
Water, Water Everywhere – Philadelphia Record, 1937-03-14
Nine visiting nurses ready for work, ca. 1909
Standard Philadelphia (B) Hydrant
Diagram showing heights of reservoirs, dams, standpipes &c, 1894
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
Schuylkill steamship excursions ad, 1852
New Plan of Philadelphia, John A. Paxton, 1811
PWD’s Lance Butler with an invasive flathead catfish