Fairmount Water Turbine Wheels (1851)
Fairmount Water Powered Water Works (1822)
Fairmount Steam Works (1815)
Centre Square Water Works, Latrobe Plans, 1799
The Centre Square Works, 1801
Gritty and the Phanatic in Ida’s Floodwaters
Centre Square Engine House, ca. 1807
Plan of the City of Philadelphia and Adjoining Districts, 1830
Map of Philadelphia showing Population in year 1920
Map of the County of Philadelphia from Actual Survey, 1843