History and evaluation of national-scale geochemical data sets for the United States

Online link http://dx.doi.org/10.1016/j.gsf.2012.07.002
Description Overview explaining how and why six different geochemical data sets were produced, and why you might choose to use the data in any one of these instead of the others.
Originators Smith, David B.; Smith, Steven M.; and Horton, John D.
Publication U.S. Geological Survey outside publications 4 (2)

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States or counties