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A map of the 9 VAAC regions

Ash Thickness and Particle Size Downwind from Mount St. Helens, Washington, on May 18, 1980

Tephra Falls of the 1991 Eruptions of Mount Pinatubo

What to do during an ash fall event

Economic costs of volcanic ash to aviation  NOAA Economics

U.S. Department of the Interior. U.S. Geological Survey. (1991). 'First international symposium on volcanic ash and aviation safety : program and abstracts : Seattle, Washington, July 8-12, 1991 [U.S. Geological Survey Circular 1065]. Denver: author.