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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pray, Thomas R
    Type: Article
    In: Pacific science
    Volume: 13
    Issue: 1
    Date: 1959
    Page Range: 3--13
    Publication Info: Honolulu, University Press of Hawaii,
  2. By: Pray, Thomas R
    Type: Article
    In: American fern journal
    Volume: 58
    Date: 1968
    Page Range: 54--64
    Publication Info: [Washington, etc.] American Fern Society