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By: Alvin, K L - Fraser, C J - Spicer, R AType: ArticleIn: PalaeontologyVolume: 24Series:Issue:Date: 1981Page Range: 759--778Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Alvin, K L - Watson, G J - Spicer, R AType: ArticleIn: PalaeontologyVolume: 37Series:Issue:Date: 1994Page Range: 173--180Publication Info: London, Palaeontological Association, 1957-Subjects: