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By: Hall, John W., - Stidd, Benton MType: ArticleIn: PalaeontologyVolume: 14Series:Issue:Date: 1971Page Range: 431--436Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Stidd, Benton MType: ArticleIn: Annals of the Missouri Botanical GardenVolume: 61Series:Issue:Date: 1974Page Range: 388--407Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-Subjects: