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By: Srivastava, Gopal Krishna - Pant, Divya Darshan - Shukla, Pradeep KumarType: ArticleIn: American fern journalVolume: 83Series:Issue:Date: 1993Page Range: 105--119Publication Info: [Washington, etc.] American Fern SocietySubjects:
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By: Pant, Divya Darshan - Singh, R ShankerType: ArticleIn: PalaeontologyVolume: 11Series:Issue:Date: 1968Page Range: 643--653Publication Info: London, Palaeontological Association, 1957-Subjects: