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By: Penn, Ian EType: ArticleIn: PalaeontologyVolume: 18Series:Issue:Date: 1975Page Range: 865--869Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Penn, Ian EType: ArticleIn: PalaeontologyVolume: 17Series:Issue:Date: 1974Page Range: 553--563Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Penn, Ian EType: ArticleIn: PalaeontologyVolume: 14Series:Issue:Date: 1971Page Range: 154--158Publication Info: London, Palaeontological Association, 1957-Subjects: