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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pember, F T
    Type: Article
    In: American fern journal
    Volume: 1
    Date: 1910
    Page Range: 17--19
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Pember, F T
    Type: Article
    In: American fern journal
    Volume: 1
    Date: 1911
    Page Range: 45--48
    Publication Info: [Washington, etc.] American Fern Society