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American Memory (National Digital Library Program)
http://memory.loc.gov/ammem/index.html -
National Archives and Records Administration
http://www.archives.gov/index.html -
History Text Archive
http://www.historicaltextarchive.com/ -
Making of America (initial phase 1850-1877)
http://www.dlib.org/dlib/july97/america/07shaw.html -
Perry-Castenda Library Map Collection : Historical Maps of the United States
http://www.lib.utexas.edu/maps/histus.html -
United States Historical Census Data Browser (1790-1960)
http://mapserver.lib.virginia.edu/