History of the expedition under the command of Captains Lewis and Clarke [sic] : 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, 1805, 1806 : by order of the government of the United States / prepared for the press by Paul Allen, Esq. ; revised and abridged by the omission of unimportant details ; with an introduction and notes, by Archibald M'Vickar.