Aerial Photo for Bourbon County, locality Porterville?, location T. 27 S., R. 21 E., quadrangle Erie NE, project KHC. Date of photo 1972-05-15. Other info 12000 ft. Range of sheets 24: 127, 81, 83, 41, 43. Number of sheets 5. Photo is located at T. 27 S., R. 21 E.