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By: Zangerl, Rainer, - Williams, Michael EType: ArticleIn: PalaeontologyVolume: 18Series:Issue:Date: 1975Page Range: 333--341Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: McIntosh, John S. - Williams, Michael EType: ArticleIn: KirtlandiaVolume: 43Series:Issue:Date: 1988Page Range: 3--26Publication Info: Cleveland, Ohio, Cleveland Museum of Natural History,Subjects: