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  1. By: Foster, Robert Crichton
    Type: Article
    In: Rhodora
    Volume: 64
    Date: 1962
    Page Range: 291--312
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Foster, Robert Crichton
    Type: Article
    In: Rhodora
    Volume: 68
    Date: 1966
    Page Range: 97--358
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  3. By: Foster, Robert Crichton
    Type: Article
    In: Rhodora
    Volume: 67
    Date: 1965
    Page Range: 97--138
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]