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.
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2002. National Geospatial Intellience Agency (formerly the U.S. Defense Mapping Agency - DMA). This datalayer is a polyline coverage representing coastlines and international boundaries for every continent including Antarctica at a scale of 1... East View Cartographic.