Plan profile and sections of proposed line of the Wissahickon high level cut off sewer from the terminus northwest of School House Lane to the Wissahickon high level sewer, 1929 August 23, Drawer: W23 & W24, Folder: 5. Wissahickon Valley Park Maps, Plans and Drawings, FP.2011.006. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/49971 Accessed January 15, 2026.