Composition of air-fall ash erupted on May 18, May 25, June 12, July 22, and August 7. The Eruption of Mount St. Helens, Washington.
収録刊行物
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- U. S. Geol. Surv. Prof. Pap.
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U. S. Geol. Surv. Prof. Pap. 1250 667-681, 1981