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American Memory: Library of Congress site providing free and open access to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience.
GeoStat Center: Housed by the University of Virginia Library this site provides historical census statistics from 1790-1960
Internet Public Library – United States History: (IPL) is a public service organization and learning/teaching environment founded at the University of Michigan School of Information and hosted by Drexel University's College of Information Science & Technology.