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  1. By: Gilman, Arthur V - Countryman, William D.
    Type: Article
    In: Rhodora
    Volume: 93
    Date: 1991
    Page Range: 390--394
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Countryman, William D.
    Type: Article
    In: Rhodora
    Volume: 70
    Date: 1968
    Page Range: 577--579
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Crow, Garrett E. - Countryman, William D. - Church, George Lyle, - Eastman, L. M. - Hellquist, C B - Mehrhoff, L L - Storks, I M
    Type: Article
    In: Rhodora
    Volume: 83
    Date: 1981
    Page Range: 259--299
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Thompson, Elizabeth H. - Countryman, William D.
    Type: Article
    In: Rhodora
    Volume: 91
    Date: 1989
    Page Range: 110--115
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  5. By: Countryman, William D.
    Type: Article
    In: Rhodora
    Volume: 82
    Date: 1980
    Page Range: 163--171
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  6. By: Countryman, William D.
    Type: Article
    In: Rhodora
    Volume: 70
    Date: 1968
    Page Range: 491--491
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],