http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Aeronautics and Space Administration.
Title from title screen (viewed on June 7, 2004).
Mode of access: Internet from the NASA Web site. Address as of 06/07/04: http://spacelink.nasa.gov/Instructional.Materials/NASA.Educational.Products/NASAs.Great.Observatories.Kit/NASA.Great.Observatories.pdf; current access is available via PURL.