Includes index.

Differs from 511 p. edition in the insertion of two new chapters: Lewis as ethnographer: the Shoshones (new chapter 23); Lewis as ethnographer: the Clatsops and the Chinooks (new chapter 27).

Bibliography: p. 503-506.

Youth, 1774-1792 -- Planter, 1792-1794 -- Soldier, 1794-1800 -- Thomas Jefferson's America, 1801 -- The President's secretary, 1801-1802 -- The origins of the expedition, 1750-1802 -- Preparing for the expedition, January-June 1803 -- Washington to Pittsburgh, June-August 1803 -- Down the Ohio, September-November 1803 -- Up the Mississippi to winter camp, November 1803-March 1804 -- Ready to depart, April-May 1804 -- Up the Missouri, May-July 1804 -- Entering Indian country, August 1804 -- Encounter with the Sioux, September 1804 -- To the Mandans, Fall 1804 -- Winter at Fort Mandan, December 21, 1804-March 21, 1805 -- Report from Fort Mandan, March 22-April 6, 1805 -- From Fort Mandan to Marias River, April 7-Junw 2, 1805 -- From Marias River to the Great Falls, June 3-June 20, 1805 -- The Great Portage, June 16-July 14, 1805 -- Looking for the Shoshones, July 15-August 12, 1805 -- Over the Continental Divide, August 13-August 31, 1805 -- Lewis as ethnographer: the Shoshones -- Over the Bitterroots, September 1-October 6, 1805 -- Down the Columbia, October 8-December 7, 1805 -- Fort Clatsop, December 8, 1805-March 23, 1806 -- Lewis as ethnographer: the Clatsops and the Chinooks -- Jefferson and the West, 1804-1806 -- Return to the NEz Perce, March 23-June 9, 1806 -- The Lolo trail, June 10-July 2, 1806 -- The Marias expedition, July 3-July 28, 1806 -- The last leg, July 29-September 22, 1806 -- Reporting to the President, September 23-December 31, 1806 -- Washington, January-March 1807 -- Philadelphia, April-July 1807 -- Virginia, August 1806-March 1807 -- St. Louis, March-December 1808 -- St. Louis, January-August 1809 -- Last voyage, September 3-October 11, 1809 -- Aftermath.

Young Adult