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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thompson, Henry J. - Roberts, J
    Type: Article
    In: Phytologia
    Volume: 21
    Date: 1971
    Page Range: 279--288
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Campbell, Kenton S. W. - Roberts, J
    Type: Article
    In: Palaeontology
    Volume: 7
    Date: 1964
    Page Range: 514--524
    Publication Info: London, Palaeontological Association, 1957-
  3. By: Brown, D. A. (David Alexander), - Campbell, Kenton S. W. - Roberts, J
    Type: Article
    In: Palaeontology
    Volume: 7
    Date: 1965
    Page Range: 682--694
    Publication Info: London, Palaeontological Association, 1957-