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National Geochemical Database: Soil

Online link https://mrdata.usgs.gov/ngdb/soil/
Description Geochemical analysis of soil samples from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are from the continental US and Alaska.
Originators U.S. Geological Survey
Metadata Questions and answers

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Schematic map showing sample density in the conterminous US
Schematic map showing sample density in the conterminous US