5. Water Works – Franklin Institute Collection for Fairmount Parks Project [3 .tif images related to Fairmount Water Works: “Park from reservoir”, “Isometric View”, and “Graff Dam” by Charles Penniman], 2009 October 24, Drawer: 2-1, Box: 3, Disk: 5. Compact Disk Collection, FP.2016.005. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/1379 Accessed April 20, 2025.