| 1. |  | High altitude aerial photograph over the site of Ft. Clark and the Missouri River, N.D. | Aerial photographs; Historic sites; Roads; Rivers; Railroad tracks; | High altitude aerial photograph over sections 22, 23, 24, 25, 26, 27, 34, 35, and 36, of Township 144 and Range 84, in Mercer County, N.D. View shows Highway 200, the Northern Pacific Railroad tracks,... |
