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 557. Results of spirit leveling in the State of Washington 1896 to 1913, inclusive
Geological Survey bulletin 557; Spirit leveling in Washington State, 1896-1913
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ProQuest U.S. Serial Set Digital Collection