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  1. By: Mehra, P N - Bir, S.S. (Sarmukh Singh),
    Type: Article
    In: American fern journal
    Volume: 50
    Date: 1960
    Page Range: 276--295
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Gill., B S - Mehra, P N
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 55
    Issue: 4
    Date: 1974
    Page Range: 663--677
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  3. By: Mehra, P N - Sareen, T S - Khosla, Prem Kumar
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 53
    Issue: 4
    Date: 1972
    Page Range: 558--568
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  4. By: Mehra, P N - Sareen, T S
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 54
    Issue: 3
    Date: 1973
    Page Range: 412--418
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-