http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Department of the Interior. United States Geological Survey. George Otis Smith, Director. Bulletin 581. Contributions to economic geology (short papers and preliminary reports) 1913
Geological Survey bulletin 581; Contributions to economic geology, 1913, 2 pts
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