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Geological Survey (U.S.). This point shapefile contains the coverage of known sediment samplings, inspections and probings from the usSEABED data collection and integrated u... United States. National Ocean Service.
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.