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Shapefile
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ESRI
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Restricted
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Columbia
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Point
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2005
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1. United States Volcanoes, 2008
2005. Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey and ESRI. 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.