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.
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2005. Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). United States Volcanoes is a polygon theme representing volcanoes thought to be active in the last 10,000 years (Holocene), in and near the United ... Esri.