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  1. By: Stevens, H A - Weedon, Ronald R., - Stephens, H A
    Type: Article
    In: Rhodora
    Volume: 71
    Date: 1969
    Page Range: 433--433
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Magrath, L K - Weedon, Ronald R.,
    Type: Article
    In: Rhodora
    Volume: 76
    Date: 1974
    Page Range: 489--490
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Mcgregor, Ronald L - Magrath, Lawrence K - Weedon, Ronald R.,
    Type: Article
    In: Rhodora
    Volume: 74
    Date: 1972
    Page Range: 378--388
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Magrath, Lawrence K - Weedon, Ronald R.,
    Type: Article
    In: American fern journal
    Volume: 62
    Date: 1972
    Page Range: 22--23
    Publication Info: [Washington, etc.] American Fern Society