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  1. By: Shellhammer, Howard S - Stecker, Ronald E - Harvey, H Thomas - Hartesveldt, Richard J
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1970
    Page Range: 408--410
    Publication Info: Berkeley, California Botanical Society,
  2. By: Harvey, H Thomas - Shellhammer, Howard S
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 38
    Date: 1991
    Page Range: 14--20
    Publication Info: Berkeley, California Botanical Society,
  3. By: Shellhammer, Howard S - Shellhammer, Thomas H
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 53
    Date: 2006
    Page Range: 342--350
    Publication Info: Berkeley, California Botanical Society,