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作者单位: | Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States; Department of Geology and Geography, West Virginia University, Morgantown, WV, United States; Department of Botany, University of Wisconsin-Madison, Birge Hall, Madison, WI, United States; U. S. Geological Survey Fort Collins Science Center, Denver, CO, United States; Department of Natural Resources and the Environment, University of Connecticut, Storrs, CT, United States
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