If you have an ereader or don't mind reading online Project Gutenberg is a free choice.
Mammals of Northwestern South Dakota by Kenneth W. Andersen
Books on Farm life -- South Dakota -- History
Land of the Burnt Thigh by Edith Eudora Kohl
Sioux Indian Courts by Doane Robinson
The Project Gutenberg EBook of American Missionary, Vol. 45, No. 2,
February, 1891, by Various
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