http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Atlas to accompany Monograph XXXI on the Geology of the Aspen District Colorado by Josiah Edward Spurr. Samuel Franklin Emmons, geologist in charge
Geological Survey monographs, v. 31; Geology of Aspen district, Colorado, atlas
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ProQuest U.S. Serial Set Digital Collection