Aerial Photo for Thomas County, locality Colby, quadrangle Colby SE, project GS-COA. Date of photo 1964-10-06. Other info Flt. 1-4 EW 6500. Range of sheets "2F: 6-1, 2B: 7-1, 4F: 43-39, 53-60, 4B: 44-39, 53-60, 1F: 170-166, 1B: 171-166". Number of sheets 46.