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By: Bir, S.S. (Sarmukh Singh), - Trikha, Chander KType: ArticleIn: American fern journalVolume: 66Series:Issue:Date: 1976Page Range: 109--110Publication Info: [Washington, etc.] American Fern SocietySubjects:
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By: Bir, S.S. (Sarmukh Singh), - Trikha, Chander KType: ArticleIn: American fern journalVolume: 58Series:Issue:Date: 1968Page Range: 119--125Publication Info: [Washington, etc.] American Fern SocietySubjects:
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By: Bir, S.S. (Sarmukh Singh), - Trikha, Chander KType: ArticleIn: American fern journalVolume: 64Series:Issue:Date: 1974Page Range: 49--63Publication Info: [Washington, etc.] American Fern SocietySubjects: