National Archives and Records Administration. http://www.nara.gov/

National Archives of Australia. http://www.naa.gov.au/

National Archives of Canada. http://www.archives.ca/08/08_e.html

National Register of Archives (Great Britain). http://www.nationalarchives.gov.uk/

National Union Catalog of Manuscript Collections (United States). http://lcweb.loc.gov/coll/nucmc/nucmc.html.