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. Charles D. Walcott, Director. Cement materials and industry of the United States
Geological Survey bulletin 243; Cement materials and industry of United States
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ProQuest U.S. Serial Set Digital Collection