Writing about these fur traders, trappers, and mountain men are Harvey L. Carter, Carl P. Russell, Ray H. Mattison, Janet Lecompte, John E. Wickman, Charles E. Hanson Jr., and Louis Pfaller. Scott Eckberg, historian at the Fort Union Trading Post National Historic Site, provides a historical overview in his introduction. LeRoy R. Hafen is the editor of "Mountain Men and Fur Traders of the Far West: Eighteen Biographical Sketches" and "Trappers of the Far West: Sixteen Biographical Sketches" (both Bison Books).