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By: Raup, David MType: ArticleIn: Field Museum of Natural History bulletinVolume: 50Series:Issue: 1Date: 1979Page Range: 22--29Publication Info: [Chicago, Ill.], The Museum, [1972]-©1990Subjects:
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By: Raup, David MType: ArticleIn: PalaeontologyVolume: 30Series:Issue:Date: 1987Page Range: 1--13Publication Info: London, Palaeontological Association, 1957-Subjects: