Plan revising lines and grades on city plans no. 261 and 299 of Gorgas Lane form Ridge Ave to a point approximately 600 feet northeastwardly of Henry Avenue. [1 sheet], 1962 March 19, 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/49601 Accessed April 20, 2025.