http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Atlas of American agriculture; physical basis including land relief, climate, soils, and natural vegetation of the United States
prepared under the supervision of O.E. Baker. Cotton, by O.C. Stine.
Later included in "Atlas of American agriculture; physical basis including land relief, climate, soils, and natural vegetation of the United States."
Selected bibliography of sources (page 4).