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USGS Mineral Resources: Geochemistry of sediments in the US from the NURE-HSS...
From the site: "Geochemical analyses of sediment samples throughout the U.S. collected by the hydrogeochemical and stream sediment reconnaissance (HSSR) phase of the National... -
USGS Mineral Resources: Geochemistry of water samples in the US from the NURE...
From the site: "Geochemical analyses of water samples throughout the U.S. collected by the hydrogeochemical and stream sediment reconnaissance (HSSR) phase of the National...