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Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2015
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Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2011
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Arlington, Va, february 1992
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Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2007
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Reston, Va: U.S. Geological Survey, 2007
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Kabul: Afghanistan Geological Survey, 2006
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Kabul: Afghanistan Geological Survey, 2006
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Reston, Va: U.S. Geological Survey, 2007
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Kabul: Afghanistan Geological Survey, 2006
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Reston: USGS, 2014
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Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2015
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Kabul: Afghanistan Geological Survey, 2007
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Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2010