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Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey. Harvard Geospatial Library. Environmental Systems Research Institute, Inc. (ESRI). (2000-11-01). U.S. National Atlas Volcanoes. [Shapefile]. Environmental Systems Research Institute, Inc. (ESRI). Retrieved from https://geo.nyu.edu/catalog/harvard-esriusvolcano