(credit: U.S. Department of the Interior, U.S. Geological Survey, The National Atlas of the United States of America/nationalatlas.gov)
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US History. Authored by: P. Scott Corbett, Volker Janssen, John M. Lund, Todd Pfannestiel, Paul Vickery, and Sylvie Waskiewicz. Provided by: OpenStax College. Located at: http://openstaxcollege.org/textbooks/us-history. License: CC BY: Attribution. License Terms: Download for free at http://cnx.org/content/col11740/latest/