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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thomas, R. Dale - Marx, Paul S
    Type: Article
    In: SIDA, contributions to botany
    Volume: 8
    Date: 1979
    Page Range: 113--113
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  2. By: Thomas, R. Dale - Marx, Paul S - Lawson, David
    Type: Article
    In: American fern journal
    Volume: 64
    Date: 1974
    Page Range: 119--120
    Publication Info: [Washington, etc.] American Fern Society