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  1. By: Bacon, John D - Bragg, Louis H. - Hannan, Gary L
    Type: Article
    In: SIDA, contributions to botany
    Volume: 11
    Date: 1986
    Page Range: 271--281
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  2. By: Hannan, Gary L
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 59
    Date: 2012
    Page Range: 28--28
    Publication Info: Berkeley, California Botanical Society,