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Date: 2009-03-30 19:09:21Mount St. Helens Cascade Volcanoes Lava dome Crater Glacier Types of volcanic eruptions St. Helens Oregon St. Helens Dacite Volcanic activity of Mount St. Helens Geology Igneous petrology Petrology | USGS professional paper 1750, contents and contributorsAdd to Reading ListSource URL: pubs.usgs.govDownload Document from Source WebsiteFile Size: 149,88 KBShare Document on Facebook |