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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...From the site: "A digital version of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b)."-
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View within SubmissionGathering Resources... -