Geochemical and mineralogical maps, with interpretation, for soils of the conterminous United States

Online link https://pubs.usgs.gov/sir/2017/5118/
Description Between 2007 and 2013, the U.S. Geological Survey conducted a low-density (1 site per 1,600 square kilometers, 4,857 sites) geochemical and mineralogical survey of soils in the conterminous United States. The sampling protocol for the national-scale surve
Originators Smith, David B.; Solano, Federico; Woodruff, Laurel G.; Cannon, William F.; and Ellefsen, Karl J.
Publication U.S. Geological Survey Scientific Investigations Report 2017-5118