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Copyright 1990 National Association of Biology Teachers
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Edwin A. Arnfield; Ecological Succession in the Pleistocene in Glacier National Park, Montana, in Relation to Current Successional Stages in the Western Mountains of the U.S.. The American Biology Teacher 1 February 1991; 53 (2): 85–90. doi: https://doi.org/10.2307/4449227
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