Shelter, toilet and guard houses, Lincoln Drive and Wissahickon Drive: plan showing door detail, chimney detail, fireplace section, roof plan, toilet cubicles, and foundation plan [2 sheets; 1 unique sheet], 1939 January 24, Drawer: Wissahickon General, Folder: 1. Wissahickon Valley Park Maps, Plans and Drawings, FP.2011.006. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/49031 Accessed July 27, 2025.