http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Detailed design of a variable volume hydrogen maser
National Aeronautics and Space Administration,
1 online resource (29 pages) : illustrations.
Title from title screen (viewed Oct. 7, 2015).
Includes bibliographical references (page 29).