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  1. By: Cooper, William Skinner,
    Publication info: Washington, Cornegie Institution of Washington, 1922
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Cooper, William Skinner,
    Publication info: Chicago, 1913
    Holding Institution: Library of Congress
  3. By: Cooper, William Skinner,
    Publication info: 1909
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: BHL Field Notes Project
  1. By: Cooper, William Skinner,
    Type: Article
    In: Botanical gazette
    Volume: 51
    Issue: 3
    Date: 1911
    Page Range: 234--234
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991