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Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2011
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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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Reston, Va: U.S. Geological Survey, 2007
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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. Geological Survey, 2002
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Washington, DC: United States Institute of Peace, June 2017
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Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2012
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Reston, Va.: U.S. Geological Survey, 2011
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Washington, DC: United States Institute of Peace, July 2017
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Washington, DC: United States Institute of Peace, September 2017