The Journals of Lewis and Clark
These Journals are from May 14, 1804, the day the expedition left the Mississippi River, to September 26, 1806, a day or two after they arrived back in St. Louis. It includes all possible Journal entries of Lewis and Clark. Most of the "courses and distances" and "celestial observations" have been omitted. The notes and most of the corrections of past editors have been removed. There are a few OCR errors, but most of the misspellings are almost 200 years old.
There are three copies of the Lewis and Clark Journals in this 3.5 megabyte zip file. The .txt tile is normal text, the .doc file is in Microsoft Word format, and the .rtf is in Real Text Format.