Title History of the expedition under the command of Captains Lewis and Clarke, 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. Rev. and abridged by the omission of unimportant details, with an introduction and notes, by Archibald M'Vickar.