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.
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2004. National Atlas of the United States. This point shapefile includes Holocene volcanoes, which are those thought to be active in the last 10,000 years, that are within an extended area o... National Atlas of the United States.