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USGS Mineral Resources: Geochemistry of sediments in the US from the NURE-HSS...
From the site: "Geochemical analyses of sediment samples throughout the U.S. collected by the hydrogeochemical and stream sediment reconnaissance (HSSR) phase of the National...-
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USGS Mineral Resources: Geochemical and mineralogical data for soils of the c...
From the site: "Systematic geochemical and mineralogical survey of soil horizons analyzed using a consistent set of methods, sample spacing 1 per 1,600 sq km."-
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