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Mount St. Helens, Washington
May 18, 1980, Ash Fallout Distribution within the U.S.


This generalized map shows the distribution of ash fallout from the May 18, 1980 eruption. -- Modified from: Tilling, Topinka, and Swanson, 1990, Eruptions of Mount St. Helens: Past, Present, and Future: USGS Special Interest Publication

Map, May 18, 1980 Ash Fallout Distribution




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02/10/08, Lyn Topinka