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"OpenStreetMap contributors"
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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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View within SubmissionGathering Resources...USGS GIS data of the United States water resources maps, soil, hydrology, and weather. Contains multiple links to useful and informative websites.-
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View within SubmissionGathering Resources... -