Folk art in the fur trade of the upper Missouri. Prologue, A Journal of the National Archives v.4 #2 Summer 1972 p.99- 108 Bear's oil or grease as an important by-product of bear hunting and an important trade article. Museum of Fur Trade Quarterly v.8 #3 Fall 1972 p.4-6 Description of the fur trade in 1831 from trader John Dougherty's letters. Nebraska History v.56 #1 Spring 1975 p.108-120
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