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  1. By: Mathieson, Arthur C. - Swan, E F - Fralick, Richard A
    Type: Article
    In: Rhodora
    Volume: 74
    Date: 1972
    Page Range: 127--130
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Mathieson, Arthur C. - Fralick, Richard A
    Type: Article
    In: Rhodora
    Volume: 75
    Date: 1973
    Page Range: 52--64
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Mathieson, Arthur C. - Fralick, Richard A
    Type: Article
    In: Rhodora
    Volume: 74
    Date: 1972
    Page Range: 406--435
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Riggs, Stanley A - Fralick, Richard A
    Type: Article
    In: Rhodora
    Volume: 77
    Date: 1975
    Page Range: 456--466
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],