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Par Collection Par Auteur- LEEMAN, W. P. (1)
- SMITH, D. R. (1)
- 1982 (1)
- Voluminous and widespread tephras were produced frequently during the last 36,000 yr of volcanic activity at Mount St. Helens. Numerous tephra sets have been defined by D. R. Mullineaux, J. H. Hyde, and M. Rubin (1975, U. S. Geological Survey