http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
The Cause of color in smoky quartz and amethyst
HOLDEN, Edward F.: -- The Cause of color in smoky quartz and amethyst.- 1925. -- Diss. Ann Arbor, Michigan Univ. -- AB/Li