Annual reports and other documents relating to Philadelphia’s water supply system, 1796-1992
Newspaper Clipping Scrapbooks of Frederic Graff Jr.,Chief Engineer of the Philadelphia Water Department: Part 1, 1854-1857
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
