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Mineralogical Variations within Two Widespread Holocene Tephra Layers from Cascade Range Volcanoes, U.S.A.Variations minéralogiques dans deux vastes couches holocènes de tephra provenant de volcans de la chaîne des Cascades, États-UnisMineralogische Schwankungen in zwei ausgedehnten holozänen Tephra-Schichten von den Vulkanen der Cascade-Kette, U.S.A

  • Étienne Juvigné and
  • Stephen C. Porter

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