The American west is the birthplace of legends. Before the outlaws, lawmen, gamblers, and cowboys made their mark however, the lands west of the Mississippi were explored by a certain 'reckless breed' of individuals. Men we know as mountain men.
These doughty men who braved empty plains, forbidding mountain ranges, and turbulent rivers, did so seeking one thing: beaver pelts, or as they called them, plews. http://www.amazon.com/Plews-Arley-L-Dial-ebook/dp/B00M3I51ZG/ref=asap_bc?ie=UTF8