http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Results of the second U.S. manned orbital space flight, May 24, 1962
Electronic reproduction. Washington, D.C. : NASA History Office.
Mode of access: Internet from the NASA History Office web site. Address as of 5/24/06: http://www.hq.nasa.gov/office/pao/History/SP-6/cover.htm; current access is available via PURL.