Since the journey was under official auspices, many records were kept. The first report of it to be published appeared in a message of President Jefferson in 1806. In 1807 the journal of Patrick Gass appeared; it was several times reissued before The History of the Expedition under the Command of Captains Lewis and Clark was published (ed. by N. Biddle and P. Allen, 2 vol., 1814; repr. 1966). This appeared in later editions by E. Coues (4 vol., 1893; repr. 1965) and J. B. McMaster (1904). R. G. Thwaites edited a full issue of Original Journals of the Lewis and Clark Expedition (8 vol., 1904–5; repr. 2001; abridged ed. by B. DeVoto, 1953, repr. 1963) and G. E. Moulton edited a definitive edition of the journals of Lewis, Clark, and members of the Corps of Discovery published as The Journals of the Lewis and Clark Expedition (13 vol., 1983–2002, abridged ed. 2003).
There have been many studies and monographs on the expedition. See study by J. Bakeless (1947, repr. 1962). See also Letters of the Lewis and Clark Expedition (ed. by D. D. Jackson, 1962); R. H. Dillon, Meriwether Lewis: A Biography (1968); P. R. Cutright, Lewis and Clark, Pioneering Naturalists (1969); D. S. Lavender, The Way to the Western Sea (1988).
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