The revision of lines and grades of that portion of city plan no. 298 bounded by Johnson Street, Wissahickon Avenue, Walnut Lane, Daniel Street, Hermit Street and Park Line Drive, 21st Ward. [1 sheet], 1918 June 13, Drawer: W18 and W19, 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/49735 Accessed April 20, 2025.