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Institute of Arctic and Alpine Research, University of Colorado, Boulder
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University of Colorado, Institute of Arctic and Alpine Research
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1989.
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Open file report volume 95-2
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Colorado Geological Survey, Division of Minerals and Geology, Department of Natural Resources
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1995.
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English
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Institute of Arctic and Alpine Research, University of Colorado
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2000.
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Institute of Arctic and Alpine Research, University of Colorado
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2004.
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Colorado Geological Survey
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1909.
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Institute of Arctic and Alpine Research, University of Colorado
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2009.
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