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  1. By: Powell, E N - Stanton, R J
    Type: Article
    In: Palaeontology
    Volume: 28
    Date: 1985
    Page Range: 1--34
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Choi, Kwang-Sik - Powell, E N - Lewis, D H - Ray, S M
    Type: Article
    In: The Biological bulletin
    Volume: 186
    Date: 1994-02-01
    Page Range: 41--61
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  3. By: Cummins, Hays - Powell, E N - Stanton, R J - Staff, G
    Type: Article
    In: Palaeontology
    Volume: 29
    Date: 1986
    Page Range: 495--518
    Publication Info: London, Palaeontological Association, 1957-