Volume one covers the period from the embarkation of the Corps from Camp Dubois in Illinois on May 14, 1804 to their arrival at the juncture of the Clearwater and Snake Rivers in western Idaho on October 10, 1805. Volume two, which includes the Appendix, begins at the mouth of Alpowai Creek in Washington on October 11, 1805 and concludes with the triumphal return to St. Louis, Missouri on September 23, 1806.

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