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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: "NHDPlus is a geo-spatial, hydrologic framework dataset envisioned by the US Environmental Protection Agency. The EPA Office of Water, assisted by the US...-
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View within SubmissionGathering Resources... -