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Roadside Geology of Mount St. Helens National Volcanic Monument and Vicinity [ Information Circular 88, 1993 ] (Washington Department of Natural Resources, Division of Geology and Earth Resources)
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![Roadside Geology of Mount St. Helens National Volcanic Monument and Vicinity [ Information Circular 88, 1993 ] (Washington Department of Natural Resources, Division of Geology and Earth Resources)](http://ecx.images-amazon.com/images/I/41bJEIsVMAL._SL250_.jpg "Roadside Geology of Mount St. Helens National Volcanic Monument and Vicinity [ Information Circular 88, 1993 ] (Washington Department of Natural Resources, Division of Geology and Earth Resources)")
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