Chemical analyses of soils and other surficial materials of the conterminous US

Geochemistry of soils and other regoliths collected and analyzed by Hans Shacklette and colleagues from 1958 until about 1976.

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https://mrdata.usgs.gov/services/ussoils (WMS, version 1.3.0)

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ussoils.zip (zipped shapefile 131k bytes)

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