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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clarkson, E. N. K. (Euan Neilson Kerr), - Eldredge, Niles. - Henry, J-L
    Type: Article
    In: Palaeontology
    Volume: 20
    Date: 1977
    Page Range: 119--142
    Publication Info: London, Palaeontological Association, 1957-