George Bird Grinnell,
Beyond the Old Frontier: Adventures of Indian-Fighters…
“ After this, the Pacific Fur Company now being at an end, Ross, Cox, and McLellan entered the service of the Northwest Company.The American Fur Company, established by Mr. Astor, began operations in 1809. One after another, other fur-trading companies were absorbed, until Astor saw himself at the head of all the fur trade south of Canada, with the possible hope of reaching out for the trade of the northern country east of the Rocky Mountains. West of that range was a vast field as yet almost untouched. ”
