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  1. By: Varley, John D. - Brewster, Wayne G. - Yellowstone National Park (Agency : U.S.)
    Publication info: [Yellowstone National Park], [National Park Service?], 1990-1992
    Holding Institution: Montana State Library
  1. By: Boyd, Diane K. - Pletscher, Daniel H. - Brewster, Wayne G.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 107
    Issue: 2
    Date: 1993
    Page Range: 230--231
    Publication Info: Ottawa Ottawa Field-Naturalists' Club