From Arrowsmith & Lewis New and Elegant General Atlas, 1804. Available also through the Library of Congress web site as a raster image.
Lewis, Samuel - Arrowsmith, Aaron
A map of Lewis and Clark's track, across the western portion ...
Scale ca. 1:4,300,000. Relief shown by hachures. Meridian: London and Washington. From Lewis, Meriwether, History of the expedition under the command of Captains Lewis and Clark, 1814. Available also through the Library of Congress Web site as a raster image. Vault AACR2
Lewis, Samuel - Clark, William - Harrison, Samuel - Bradford and Inskeep