Washington Square: Plan of Washington Square. Signed by William C. Cranmer, surveyor and regulator, 3rd district. [ID: 12B-561; PWD ERV: 1075979; Drawing No.: 7187], 1894 September 18, Drawer: N10, 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/4865 Accessed October 31, 2025.