Ghosts of Water in Fairmount Park, Part 1, with Adam Levine
Plans and maps of the Pennypack Creek Watershed in Philadelphia
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
