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The Library of Congress
http://www.loc.gov/index.html
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National Geographic
http://www.nationalgeographic.com/
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The National Archives
http://www.archives.gov/
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Gettysburg National Military Park
http://www.nps.gov/gett
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Colonial Williamsburg
http://www.history.org/history/
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The Maryland Historical Society
http://www.mdhs.org/
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