History of the Expedition Under the Command of Captains Lewis and Clark, Vol. 2. To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean. Performed During the Years 1804-5-6. - Clark, William, 1770-1838; Lewis, Meriwether, 1774-1809; Allen, Paul, 1775-1826 [Editor]