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  1. By: Roy, Graham - Kelso, Sylvia - Tonnesen, Alex S.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 40
    Date: 1993
    Page Range: 236--245
    Publication Info: Berkeley, California Botanical Society,
  2. By: Tonnesen, Alex S. - Ebersole, James J
    Type: Article
    In: The Great Basin naturalist
    Volume: 57
    Issue: 1
    Date: 1997
    Page Range: 50--56
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,