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Freiberg: Bergakademie, 1972
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Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2013
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Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2012
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Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2019
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Reston: U.S. Geological Survey, 2018
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Reston: U.S. Geological Survey, 2018
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Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2016
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Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2016
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Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2015
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Washington: USGS, 2013
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Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2012
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Reston: U.S. Geological Survey, 2009
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Reston, Va: U.S. Geological Survey, 2008
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Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2015
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Reston: U.S. Geological Survey, 2020
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Reston: U.S. Geological Survey, 2019
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Reston: U.S. Geological Survey, 2018
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Reston: U.S. Geological Survey, 2018
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Reston: U.S. Geological Survey, 2017
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Reston: U.S. Geological Survey, 2017