有声读物: Journal of Lewis and Clarke (1840)

"The expedition of Messrs. Lewis and Clarke, for exploring the river Missouri, and the best communication from that to the Pacific Ocean, has had all the success which could be expected. They have traced the Missouri nearly to its source; descended the Columbia to the Pacific Ocean, ascertained with accuracy the Geography, of that interesting communication across the continent; learned the character of the country, its commerce and inhabitants; and it is but justice to say that Messrs. Lewis and Clarke, and their brave companions, have, by this arduous service, deserved well of their country." This volume is the 1840 edition with woodcut images and an Indian vocabulary. They may be viewed by clicking on the text URL. (Summary in quotes by President Thomas Jefferson)