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Date: 2015-08-12 16:05:02Geology Volcanology Gifford Pinchot National Forest Volcanic rocks Lava domes Cascade Volcanoes Helenite Explosive eruption Mount St. Helens Types of volcanic eruptions Pyroclastic rock Volcano | Vol. 53, No. 3 Pendleton District Gem and Mineral Society March 2015Add to Reading ListSource URL: pdgms.orgDownload Document from Source WebsiteFile Size: 528,16 KBShare Document on Facebook |
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