Aerial Photo for Morton County, locality Richfield, location T 33 S; R 42 W, quadrangle Richfield SW, project GS-SWFD. Date of photo 1971-11-11. Other info Flights 1-4: NS 6,700. Range of sheets "1: 22-16, 67-72, 110-105, 2: 23-29". Number of sheets 25. Photo is located at T 33 S; R 42 W