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  1. By: Raup, David M
    Type: Article
    In: Field Museum of Natural History bulletin
    Volume: 50
    Issue: 1
    Date: 1979
    Page Range: 22--29
    Publication Info: [Chicago, Ill.], The Museum, [1972]-©1990
  2. By: Raup, David M
    Type: Article
    In: Palaeontology
    Volume: 30
    Date: 1987
    Page Range: 1--13
    Publication Info: London, Palaeontological Association, 1957-