http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Aeronautics and Space Administration.
Scientific and Technical Information Office.
"A series of eight articles reprinted by permission from the March 1970 issue of Astronautics & Aeronautics."
Electronic reproduction. Washington, D.C. : NASA History Office.
Mode of access: Internet from the NASA History Office web site. Address as of 6/5/06: http://history.nasa.gov/SP-287/sp287.htm; current access is available via PURL.