Neal, C.A., and Guffanti, Marianne, 2010, Airborne volcanic ash - a global threat to aviation: U.S. Geological Survey Fact Sheet 2010-3116, 6 p., available online at http://pubs.usgs.gov/fs/2010/3116/fs2010-3116.pdf .
Citation Updated: 2014-05-15 20:32:18