2013. United States. Department of State. Office of the Geographer. This polygon shapefile contains the boundaries of countries in Asia (including Russia). This layer, created by the Office of the Geographer, combin... United States. Department of State. Office of the Geographer. Humanitarian Information Unit.
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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.