Northern Prairie Wildlife Research Center
Ferris was a trapper who kept a remarkable journal of his travels in the west. Between 1831 and 1834, he was in and out of the area which is now Montana and he recorded general natural history notes as they related to his travels in western Montana. He traveled along the Missouri, Dearborn, Madison, Jefferson, and Beaverhead Rivers in southwestern Montana. He also traveled along the Clark Fork and Blackfoot Rivers and spent time in the Flathead Lake region. Ferris gave one of the first accurate descriptions of geysers on the upper Madison River in what is now Yellowstone Park.
Ferris, W.A. 1940. Life in the Rocky Mountains. The Old West Pub. Co.