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By: Hall, John W.,Type: ArticleIn: American fern journalVolume: 58Series:Issue:Date: 1968Page Range: 77--88Publication Info: [Washington, etc.] American Fern SocietySubjects:
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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: