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1. U.S. National Atlas Volcanoes 2008

2005. Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey. 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.

2. United States Volcanoes, 2012

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.