Books by Wash.) International Symposium on Volcanic Ash and Aviation Safety (1st : 1991 : Seattle:
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International Symposium on Volcanic Ash and Aviation Safety (1st : 1991 : Seattle, Wash.): Volcanic ash and aviation safety. (U.S. Dept. of the Interior, U.S. Geological Survey :, 1991), also by Thomas J. Casadevall, Geological Survey (U.S.), Aerospace Industries Association of America, and Air Line Pilots Association (page images at HathiTrust)- International Symposium on Volcanic Ash and Aviation Safety (1st : 1991 : Seattle, Wash.): Volcanic ash and aviation safety : proceedings of the First International Symposium on Volcanic Ash and Aviation Safety (U.S. G.P.O. ;, 1994), also by Thomas J. Casadevall, Geological Survey (U.S.), and Air Line Pilots Association (page images at HathiTrust)
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