Penn Treaty Park: Penn Treaty Park, 18th ward. Department of Public Works and Bureau of Surveys. Signed by Chief Engineer George S. Webster. Notation added 6/5/1893. [ID: 12B-553; PWD ERV: 1075987; Drawing No.: 2332], c. 1893, Drawer: N8, Folder: 3.1. Philadelphia Water Department 12B - Drawings Donation, FP.2019.002. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/4857 Accessed June 09, 2025.