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By: Jefferson, Timothy HType: ArticleIn: PalaeontologyVolume: 25Series:Issue:Date: 1982Page Range: 681--708Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Jefferson, Timothy HType: ArticleIn: PalaeontologyVolume: 30Series:Issue:Date: 1987Page Range: 233--249Publication Info: London, Palaeontological Association, 1957-Subjects: