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2010. 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... Environmental Systems Research Institute (Redlands, Calif.).
Relief shown by hachures and spot heights. Reefs, bays, harbors, and anchorages are shown. From: Journal of the Royal Geographical Society of Londo... London : published for the Journal of the Royal Geographical Society, by J. Murray, Albemarle Street, 1868.
2004. National Atlas of the United States. This point shapefile includes Holocene volcanoes, which are those thought to be active in the last 10,000 years, that are within an extended area o... National Atlas of the United States.