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Geology / 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 2015
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Document Date: 2015-08-12 16:05:02

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File Size: 528,16 KB

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