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  1. Correspondence : Tweedy (Frank) and Engelmann (George), 1882-1883.
    By: Tweedy, Frank,
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  2. Flora of the Yellowstone National Park / by Frank Tweedy.
    By: Tweedy, Frank,
    Publication info: Washington, D.C. :F. Tweedy,1886.
    Contributed by: University of California Libraries (archive.org)
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  3. Flora of the Yellowstone National Park / by Frank Tweedy.
    By: Tweedy, Frank,
    Publication info: Washington, D.C. :Published by the author,1886.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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