http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
brief history of geomagnetism and a catalog of the collections of the National Museum of American History
iii, 87 pages : illustrations, maps ; 28 cm.
National Museum of American History (U.S.)
Smithsonian studies in history and technology ; 48