Annual reports and other documents relating to Philadelphia’s water supply system, 1796-1992
Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)
Newspaper Clipping Scrapbooks of Frederick Graff Jr., Chief Engineer of the Philadelphia Water Department. Part 2: 1858-1871
Centre Square Water System
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Bridge Street Draw, July 26, 1897
Electric Pump Installations at Lardner’s Point Pumping Station
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
New Mill House at Fairmount
