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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cox, Billy Joe,
    Type: Article
    In: Rhodora
    Volume: 76
    Date: 1974
    Page Range: 422--445
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Dunn, David B. - Cox, Billy Joe,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 22
    Date: 1973
    Page Range: 25--29
    Publication Info: Berkeley, California Botanical Society,
  3. By: Cox, Billy Joe,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 22
    Date: 1973
    Page Range: 169--177
    Publication Info: Berkeley, California Botanical Society,