Topographical Plan of Glen Fern Wissahickon, prepared by the Committee on Preservation of Historic Monuments The Philadelphia Chapter of the American Institute of Architects. [3 sheets; 1 unique sheet], 1916 October 16, Drawer: W13 and W14, 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/49540 Accessed April 20, 2025.