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  1. By: Crow, Garrett E. - Ritter, Nur
    Type: Article
    In: Rhodora
    Volume: 101
    Date: 1999
    Page Range: 28--39
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Ritter, Nur - Crow, Garrett E.
    Type: Article
    In: Rhodora
    Volume: 102
    Date: 2000
    Page Range: 217--224
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Ritter, Nur - Wiersema, John Harry - Crow, Garrett E.
    Type: Article
    In: Rhodora
    Volume: 103
    Date: 2001
    Page Range: 326--331
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Ritter, Nur
    Type: Article
    In: Rhodora
    Volume: 106
    Date: 2004
    Page Range: 1--32
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],