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  • An increase in herbivory of cottonwood in Yellowstone National Park 

    Keigley, Richard B. (WSU Press, 1997)
    This study examined an effect of elk (Cervus elaphus nelsoni) on narrowleaf cottonwood (Populus angustifolia) in northern Yellowstone National Park, where stands consist of old trees and younger, densely-branched bushes. ...