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  1. By: Keammerer, Warren R. - Johnson, W Carter - Burgess, Robert L.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 1
    Date: 1975
    Page Range: 5--19
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Dixon, Mark D - Johnson, W Carter
    Type: Article
    In: The Great Basin naturalist
    Volume: 59
    Issue: 1
    Date: 1999
    Page Range: 18--34
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,
  3. By: Johnson, W Carter
    Type: Article
    In: Rhodora
    Volume: 72
    Date: 1970
    Page Range: 554--554
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],