http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Geochemical and mineralogical maps for soils of the conterminous United States
1 online resource (xiii, 386 pages) : color maps.
Title from title screen (viewed on May 28, 2014).
Includes bibliographical references (pages 7-10).
Open-file report (Geological Survey (U.S.)) ; 2014-1082