Citation

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://earthworks.stanford.edu/catalog/harvard-esriusvolcano