Jefferson Fork, Missouri River, United States (Google Maps ⧉, OpenStreetMap ⧉)
Referenced In
History of the Expedition under the Command of Captains Lewis and Clark / To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean
by Meriwether Lewis, William Clark"“…CHAP. XIII. The name of the Missouri changed, as the river now divides itself into three forks, one of which is called after Jefferson…”"