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FREQUENCY AND REGIONAL EXTENT OF ASH ERUPTIONS FROM ALASKAN VOLCANOES
Beget, J. E., Swanson, S. E., and Stone, D. B., 1991, Frequency and regional extent of ash eruptions from Alaskan volcanoes [abs.]: in Casadevall, T. J., (ed.), First international symposium on volcanic ash and aviation safety, U.S. Geological Survey Circular C 1065, p. 13.