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USGS Mineral Resources: National Geochemical Survey database
From the site: "National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for...-
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USGS Mineral Resources: PGE-Ni-Cr deposit and occurrence
From the site: "A compendium of previously published databases and database records that describe PGE, nickel, and chromium deposits and occurrences."-
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National Geologic Map Database
A distributed archive of standardized geoscience spatial information and data for the nation. Developed by the USGS and State Geological Surveys.-
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