MapServer WFS National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km. geochemistry; unconsolidated deposits; chemical analysis http://mrdata.usgs.gov/services/ngs&? natgeochem-high National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km. geochemistry; unconsolidated deposits; chemical analysis EPSG:4267 http://mrdata.usgs.gov/metadata/ofr-2004-1001.xml natgeochem-low National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km. geochemistry; unconsolidated deposits; chemical analysis EPSG:4267 http://mrdata.usgs.gov/metadata/ofr-2004-1001.xml