Perkiomen Water Supply Surveys, 1866
Plan of the City of Philadelphia and Adjoining Districts, 1830
Map of Philadelphia showing Population in year 1920
Outline Map of the County and City of Philadelphia and Vicinity, 1883
1779 Revolutionary War-era map of Philadelphia and environs
Centennial Exhibition situation plan, 1876
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
Electric Pump Installations at Lardner’s Point Pumping Station
Fairmount Park, bird’s eye view from Lemon Hill, detail
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
