A journal of the voyages and travels of a corps of discovery, under the command of Capt. Lewis and Capt. Clarke of the Army of the United States, from the mouth of the River Missouri through the interior parts of North America to the Pacific ocean, during the years 1804, 1805 & 1806 : Containing an authentic relation of the most interesting transactions during the expedition,--a description of the country,--and an account of its inhabitants, soil, climate, curiosities and vegetable and animal productions / By Patrick Gass, one of the persons employed in the expedition. With geographical and explanatory notes by the publisher ...