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  1. By: Kennedy, W. J. (William James) - Jakobson, M E - Johnson, R T
    Type: Article
    In: Palaeontology
    Volume: 12
    Date: 1969
    Page Range: 549--554
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Mckerrow, W S - Johnson, R T - Jakobson, M E
    Type: Article
    In: Palaeontology
    Volume: 12
    Date: 1969
    Page Range: 56--83
    Publication Info: London, Palaeontological Association, 1957-