Portion of city plan no. 299 plan of the revision of lines and grades of Gorgas Lane from the northeast side of Henry Avenue to Lawnton Street and of Haly Street from Gorgas Lane to Valley Avenue, 21st Ward, 1928 January 16, Drawer: W15, W16, & W17, Folder: 4. Wissahickon Valley Park Maps, Plans and Drawings, FP.2011.006. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/49587 Accessed November 03, 2025.