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  1. 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.],
  2. By: Magrath, Lawrence K - Norman, James L
    Type: Article
    In: SIDA, contributions to botany
    Volume: 13
    Date: 1989
    Page Range: 371--372
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  3. 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
  4. By: Magrath, Lawrence K
    Type: Article
    In: Rhodora
    Volume: 72
    Date: 1970
    Page Range: 141--141
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],