2003. American Geological Institute, Geological Survey (U.S.), and Environmental Systems Research Institute (Redlands, Calif.). This datalayer is a polygon coverage showing U.S. Geological Survey defined geologic provinces of the World, excluding the United States. It was pu... American Geological Institute.
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2003. Smithsonian Institution. Global Volcanism Program, American Geological Institute, Geological Survey (U.S.), and Environmental Systems Research Institute (Redlands, Calif.). This datalayer is point coverage containing basic geographic and geologic information for worldwide volcanoes thought to have been active in the la... American Geological Institute.