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  • American Studies at the University of Virginia. "Pilgrims and Puritans: Background." http://xroads.virginia.edu/~CAP/puritan/purhist.html
  • Groleau, Rick. "Tracing Ancestry with MtDNA." NOVA Online. http://www.pbs.org/wgbh/nova/neanderthals/mtdna.html
  • ­Haywood, John, Ph.D. Atlas of World History. Barnes & Noble (2001).
  • Human Rights Watch. "Iraqi Refugees: Summary." http://hrw.org/backgrounder/refugees/iraq0407/1.htm#_Toc164487346
  • The Institute of Arctic and Alpine Research. "Postglacial Flooding of the Bering Land Bridge: A Geospatial Animation." http://instaar.colorado.edu/QGISL/bering_land_bridge/
  • Jewish Virtual Library. "The Tragedy of the S.S. St. Louis." http://www.jewishvirtuallibrary.org/jsource/Holocaust/stlouis.html
  • National Geographic. The Genographic Project. http://­www­.nationalgeographic.com/genographic/atlas.html­
  • Schopf, J. William. Major Events In The History Of Life. Jones & Bartlett, (December 17, 1991).
  • ­Smithsonian Institution. "Theories on Modern Human Origins and Diversity." http://anthropology.si.edu/humanorigins/faq/Encarta/diversity.htm#ooa
  • United Nations Department of Economic and Social Affairs, Population Division. "World Urbanization Prospects: The 2005 Revision." http://www.un.org/esa/population/publications/WUP2005/2005wup.htm
  • U.S. Census Bureau. "Table 2. Population of the 24 Urban Places: 1790." http://www.census.gov/population/documentation/twps0027/tab02.txt
  • U.S. Census Bureau. "Table 7. Population of the 100 Largest Urban Places: 1840." http://www.census.gov/population/documentation/twps0027/tab07.txt
  • U.S. Census Bureau. "Table 2. Population, Housing Units, Area Measurements, and Density: 1790 to 1990." http://www.census.gov/population/censusdata/table-2.pdf
  • United States Holocaust Memorial Museum. "German-Jewish Refugees, 1933-1939." http://devdata.worldbank.org/wdipdfs/table3_10.pdf
  • U.S. Census Bureau. "State-to-State Migration Flows: 1995 to 2000." http://www.census.gov/prod/2003pubs/censr-8.pdf­