Northern Prairie Wildlife Research Center
Thaddeus Culbertson was the younger brother of Alexander Culbertson and was educated at Yale in biology. He spent time at Forts Pierre, Clark, and Union in 1850 observing Indians and wildlife and traveled up the Missouri River to the mouth of the Milk River. The elder Culbertson arranged a trip for his younger brother from Fort Pierre to the badlands of South Dakota to make natural history observations and collect fossils. His notes are probably some of the best natural history notes of this area for that time period. McDermott has included, with Culbertson's journal, the list of plants collected by Culbertson, and birds and mammals observed by Edward Harris along the upper Missouri River.
McDermott, J.F., ed. 1950. Journal of an expedition to the Mauvaises Terres and the upper Missouri in 1850 by Thaddeus Culbertson. Smithsonian Institution Bulletin on American Ethnology 147:1-145. Porter, T.C. 1851. List of plants collected by Mr. T.A. Culbertson on an expedition to the Mauvaises Terres and upper Missouri in 1850. Fifth Annual Report. Smithsonian Institution, Washington DC. 1851:133-136.