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  1. By: Steers, Robert J - Allen, Edith B
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 59
    Date: 2012
    Page Range: 14--24
    Publication Info: Berkeley, California Botanical Society,
  2. By: Steers, Robert J - Curto, Michael - Holland, V L
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 55
    Date: 2008
    Page Range: 26--40
    Publication Info: Berkeley, California Botanical Society,