Paul Russell Cutright, professor of biology at Beaver College in Glenside, Pennsylvania, is the author of two books, The Great Naturalists Explore South America and Theodore Roosevelt the Naturalist . For much of the technical information in this article he is indebted to Dr. R. G. Williams, Joseph Leidy Professor of Anatomy, University of Pennsylvania School of Medicine.
For further reading: The Course of Empire , by Bernard DeVoto (Houghton Mifflin, 1952); The Journals of Lewis and Clark , edited by Bernard DeVoto (Houghton Mifflin, 1953); Letters of the Lewis and Clark Expedition , edited by Donald Jackson (University of Illinois Press, 1962); and Lewis and Clark, Partners in Discovery , by John Bakeless (William Morrow & Co., 1947).
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