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  1. By: Sugden, Lawson G
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 4
    Date: 1979
    Page Range: 599--607
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Sugden, Lawson G
    Type: Article
    In: The Canadian field-naturalist
    Volume: 91
    Issue: 4
    Date: 1977
    Page Range: 372--376
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Sugden, Lawson G - Thurlow, William J. - Harris, Robert D. - Vermer, Kees
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 3
    Date: 1974
    Page Range: 303--311
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Wobeser, Gary - Gajadhar, Alvin - Beyersbergen, Gerry W. - Sugden, Lawson G
    Type: Article
    In: The Canadian field-naturalist
    Volume: 95
    Issue: 4
    Date: 1981
    Page Range: 471--473
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Sugden, Lawson G
    Type: Article
    In: The Canadian field-naturalist
    Volume: 74
    Issue: 3
    Date: 1960
    Page Range: 163--163
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  6. By: Sugden, Lawson G
    Type: Article
    In: The Canadian field-naturalist
    Volume: 85
    Issue: 4
    Date: 1971
    Page Range: 324--325
    Publication Info: Ottawa Ottawa Field-Naturalists' Club