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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Matten, L C - Lacey, William Springthorpe, - Edwards, D
    Type: Article
    In: Phytologia
    Volume: 32
    Date: 1975
    Page Range: 299--303
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Hibbert, F Alan - Lacey, William Springthorpe,
    Type: Article
    In: Palaeontology
    Volume: 12
    Date: 1969
    Page Range: 420--440
    Publication Info: London, Palaeontological Association, 1957-