http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Aeronautics and Space Administration.
Electronic reproduction. Washington, D.C. : NASA History Division.
Mode of access: Internet from the NASA History Division web site. Address as of 5/15/06: http://www.hq.nasa.gov/office/pao/History/SP-4901/table.htm; current access is available via PURL.
Unmanned space project management : surveyor and lunar orbiter