The Library of Congresshttp://www.loc.gov/index.html
National Geographichttp://www.nationalgeographic.com/
The National Archiveshttp://www.archives.gov/
Gettysburg National Military Parkhttp://www.nps.gov/gett
Colonial Williamsburghttp://www.history.org/history/
The Maryland Historical Societyhttp://www.mdhs.org/
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