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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thiers, Harry D., - Sundberg, Walter J
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1976
    Page Range: 448--453
    Publication Info: Berkeley, California Botanical Society,
  2. By: Sundberg, Walter J
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 21
    Date: 1971
    Page Range: 15--20
    Publication Info: Berkeley, California Botanical Society,