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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hoover, Robert F
    Type: Article
    In: American fern journal
    Volume: 56
    Date: 1966
    Page Range: 17--26
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Hoover, Robert F
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 5
    Date: 1940
    Page Range: 137--147
    Publication Info: Berkeley, California Botanical Society,
  3. By: Hoover, Robert F
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 4
    Date: 1937
    Page Range: 130--132
    Publication Info: Berkeley, California Botanical Society,
  4. By: Hoover, Robert F
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 3
    Date: 1936
    Page Range: 227--230
    Publication Info: Berkeley, California Botanical Society,