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  1. Trees and flowers of Yellowstone National Park /
    By: Thone, Frank, - United States.
    Publication info: Saint Paul :J.E. Haynes,c1923.
    Contributed by: Harold B. Lee Library (archive.org)
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  2. Trees and flowers of Yellowstone National Park. Approved by the National Park Service.
    By: Thone, Frank, - United States.
    Publication info: Saint Paul,J.E. Haynes[1923]
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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