LEWIS, Meriwether (1774?1809); CLARK, William (1770?1838. A Map of Lewis and Clark?s Track, Across the Western Portion of North America from the Mississippi to the Pacific Ocean; By Order of the Executive of the United States, in 1804, 5 & 6. Copied by Samuel Lewis from the Original Drawing of Wm. Clark. [Philadelphia: American Philosophical Society, 1979]. Copper plate engraving on French all rag BFK Rives paper. Second printing from the original plate prepared for the first printing of the History of the Expedition under the command of Captains Lewis and Clark, 1814. In June?July 1979, 160 impressions of the original plate were taken, this being number 7 of 150 copies (penciled in lower right margin). Plate area, 12 ? x 28 ??. Museum quality framed, 21 x 37?. A FINE IMPRESSION. Howes L317 ?dd?. Referred to as the ?second printing? of the single most important printed map of the West in American History.