Map of the County of Philadelphia from Actual Survey, 1843
Philadelphia the Manufacturing and Industrial Capital map, 1906
1779 Revolutionary War-era map of Philadelphia and environs
Centennial Exhibition situation plan, 1876
PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
Portrait of Samuel H. Ashbridge, Mayor
Philadelphia Water Department chief engineer John Trautwine Jr., 1890s
Nine visiting nurses ready for work, ca. 1909
Fairmount Park, bird’s eye view from Lemon Hill, detail
