1998. Causey, J. Douglas. and Geological Survey (U.S.). This datalayer is a point coverage representing mine and mineral resource occurrence data worldwide (most thoroughly within the U.S.) and was publi... U.S. Geological Survey.
Search Results
2000. Lee M. Osmonson, USGS, Denver, CO (comp.).
This shapefile includes arcs and polygons that describe U.S. Geological
Survey defined geologic provinces of the World. Each province has a set o... U.S. Geological Survey.