
The Standing Rock Indian Reservation and Cheyenne River Indian Reservation dominate this landscape of the north-central Dakotas, as it appeared in the mid-1950s. The Missouri River is seen here transformed into the Oah E Reservoir, a major structural shift that redefined the eastern edge of the region. This period shows the Chicago Milwaukee St Paul and Pacific railroad threading through dozens of prairie settlements, from the regional hub of Mobridge to smaller stops like Watauga and Mahto.
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