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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, J. Harlan (Jesse Harlan),
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 18
    Date: 1925
    Page Range: 305--306
    Publication Info: Washington [etc Washington Academy of Sciences]
  2. By: Johnson, J. Harlan (Jesse Harlan),
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 11
    Issue: 6
    Date: 1966-01-07
    Page Range: 255--280
    Publication Info: London, BM(NH),