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  1. Flora of northeastern Pennsylvania / by Alfred Twining.
    By: Twining, Alfred, - Everhart Museum.
    Publication info: Scranton, Pa. :Everhart Museum of Natural History, Science and Art,1917.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  2. Flora of Northeastern Pennsylvania, Alfred Twining.
    By: Twining, Alfred,
    Publication info: Scranton, Pa.,Everhart Museum of Natural History, Science and Art,1917.
    Contributed by: NCSU Libraries (archive.org)
    View Book