2001. Smithsonian Institution. Global Volcanism Program, Geological Survey (U.S.), and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years, in and near the United States. The data are a sub... ESRI.
    
  
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      2004. Geological Survey (U.S.), Smithsonian Institution. Global Volcanism Program, and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years, in and near the United States. The data are a sub... ESRI.
    
  
    
      2005. Geological Survey (U.S.), Smithsonian Institution. Global Volcanism Program, and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years (Holocene), in and near the United States. The dat... ESRI.