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THE NATIONAL VOLCANO EARLY WARNING SYSTEM (NVEWS)
Ewert, John, Guffanti, Marianne, Cervelli, Peter, and Quick, James, 2006, The National Volcano Early Warning System (NVEWS): U.S. Geological Survey Fact Sheet FS 2006-3142, 2 p., available at http://pubs.usgs.gov/fs/2006/3142 . PDF on USGS server : 1 MB