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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Zobel, Bruce,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 12
    Date: 1953
    Page Range: 1--7
    Publication Info: Berkeley, California Botanical Society,
  2. By: Zobel, Bruce,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 11
    Date: 1952
    Page Range: 283--284
    Publication Info: Berkeley, California Botanical Society,
  3. By: Zobel, Bruce, - Cech, Franklin
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 14
    Date: 1957
    Page Range: 133--144
    Publication Info: Berkeley, California Botanical Society,