Stereoscopic coverage. Shows all of the Niagara Peninsula, east of Brantford, Rockton, Guelph. Includes Halton Region south of Georgetown, Mississauga. Includes all of Wentworth County except parts of Flamborough. On verso: Department of Mines & Technical Surveys, government of Canada copyright. Source: Spartan Air Services Ltd. [Golden Horseshoe Area], Job 1086A.