This database is superseded by soil geochemistry of the National Geochemical Database. Geochemical data for soils collected in the United States and analyzed by the USGS. The data were originally entered into the in-house PLUTO database. This is a subset of DDS-47.
Get the entire data set:
plutosoil.zip (zipped shapefile 3M bytes)
Metadata:
About the database tables and fields