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4by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2006
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5Published 2006“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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6by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2007
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7by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2007
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8Published 2008“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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9by Nagle, David B.“...U.S. Dept. of the Interior, U.S. Geological Survey ; National Park Service : National Aeronautics...”
Published 2009
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