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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Spira, Timothy P
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 34
    Date: 1987
    Page Range: 315--323
    Publication Info: Berkeley California Botanical Society
  2. By: Spira, Timothy P
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 28
    Date: 1981
    Page Range: 44--44
    Publication Info: Berkeley California Botanical Society