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  1. By: Watkins, John V.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 51
    Issue: 603
    Date: 1950-03
    Page Range: 53--63
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-
  2. By: Watkins, John V.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 40
    Issue: 478
    Date: 1939-10
    Page Range: 229--233
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-