Ontario Park: Patting for Ontario Park, 20th ward. Department of Public Works and Bureau of Surveys. Details of section of coping, profile on diagonal walk from 13th Street and Thompson Street to Ontario Street and Stiles Street. [ID: 12B-555; PWD ERV: 1075985; Drawing No.: 7001], c. 1890, Drawer: N7, Folder: 4.1. Philadelphia Water Department 12B - Drawings Donation, FP.2019.002. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/4859 Accessed June 09, 2025.