Beget, J.E., Swanson, S.E., and Stone, David, 1991, Frequency and regional extent of ash eruptions from Alaskan volcanoes, in Casadevall, T.J., ed., First international symposium on Volcanic ash and aviation safety: U.S. Geological Survey Circular 1065, p. 13-13.
This publication is part of a larger work. Please see C 1065 for more information.