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 573. Results of spirit leveling in Arizona 1899 to 1915, inclusive
Geological Survey bulletin 573; Spirit leveling in Arizona, 1899-1915
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ProQuest U.S. Serial Set Digital Collection