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  1. By: Harper, Robert A - Richards, Herbert M. (Herbert Maule), - Berkey, Charles Peter, - Lee, Frederic S. (Frederic Schiller), - Gies, William John, - Rusby, Henry Hurd, - Britton, Nathaniel Lord,
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 28
    Issue: 326
    Date: 1927-02
    Page Range: 44--45
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-
  2. By: Mclean, Forman T - Howe, Marshall A. (Marshall Avery), - Harper, Robert A - Graham, Margaret A - Pady, S M
    Type: Article
    In: Torreya
    Volume: 34
    Issue: 3
    Date: 1934
    Page Range: 78--83
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  3. By: Harper, Robert A - Britton, Nathaniel Lord, - Howe, Marshall A. (Marshall Avery),
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 29
    Issue: 342
    Date: 1928-06
    Page Range: 137--138
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-