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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Scora, Rainer W
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 18
    Date: 1965
    Page Range: 119--122
    Publication Info: Berkeley, California Botanical Society,
  2. By: Scora, Rainer W - Wagner, Warren H.‏ (Warren Herbert),‏
    Type: Article
    In: American fern journal
    Volume: 54
    Date: 1964
    Page Range: 105--113
    Publication Info: [Washington, etc.] American Fern Society