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  1. Flower ecology.
    By: Pammel, Louis Herman,
    Publication info: [n.p.]Press of J. B. Hungerford[1898]
    Contributed by: Cornell University Library
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  2. Major John F. Lacey; memorial volume, published by the Iowa Park and Forestry Association.
    By: Iowa Conservation Association. - Pammel, Louis Herman,
    Publication info: Cedar Rapids, Ia.,The Torch Press,1915
    Contributed by: Library of Congress
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