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  • "Alaska Purchase." Encyclopedia Britannica. 2008. Encyclopedia Britannica Online. 15 May 2008. http://search.eb.com/eb/article-9005366.
  • "crop rotation." Encyclopedia Britannica. 2008. Encyclopedia Britannica Online. 14 May 2008 http://search.eb.com/eb/article-9027983.
  • Economic History Services. Accessed April 28, 2008. http://www.lib.umich.edu/govdocs/stats.html
  • Hemphill, W. Edwin. "The Jeffersonian Background of the Louisiana Purchase." The Mississippi Valley Historical Review. Vol. 22, No. 2. September 1935.
  • Holton, Woody. "The Price Was Right." Reviews in American History. Volume 32, Number 2, June 2004.
  • Gitlin, Jay "Children of Empire of Concitoyens?" from "The Louisiana Purchase: Emergence of an American Nation." Peter J. Kastor, editor. 2002.
  • Kastor, Peter J. "The Nation's Crucible: The Louisiana Purchase and the Creation of America." 2004.
  • Kennedy, Roger G. "Mr. Jefferson's Lost Cause." 2003.
  • Kukla, Jon. "A Wilderness So Immense: The Louisiana Purchase and the Destiny of America." 2003.
  • PBS' New Perspectives on the West. Accessed May 15, 2008. http://www.pbs.org/weta/thewest/resources/archives/one/louispur.htm
  • The Louisiana Purchase: A Heritage Explored. Accessed May 15, 2008. http://www.lib.lsu.edu/special/purchase/
  • Thomas Jefferson's Monticello. Accessed April 28, 2008. http://www.monticello.org
  • U.S. Census Bureau. Accessed May 12, 2008. http://www.census.gov/history/www/1800/010906.html
  • U.S. Department of State. Accessed May 14, 2008. http://www.state.gov/r/pa/ho/time/gp/17662.htm
  • Winfield, Betty Houchin. "Public Perception and Public Events" from "The Louisiana Purchase: Emergence of an American Nation." Peter J. Kastor, editor. 2002.