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  1. By: Lanyon, Scott M - Stotz, Douglas F. (Douglas Forrester), - Willard, David E.
    Type: Article
    In: The Wilson bulletin
    Volume: 102
    Issue: 4
    Date: 1990
    Page Range: 571--580
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Tello, Jose G - Degner, Jacob F - Bates, John M. (John Mark), - Willard, David E.
    Type: Article
    In: Fieldiana
    Volume: 106
    Date: 2006
    Page Range: 49--57
    Publication Info: [Chicago], Chicago Natural History Museum, [1945?-
  3. By: Fitzpatrick, John W. - Willard, David E. - Terborgh, John W.,
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 2
    Date: 1979
    Page Range: 177--186
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  4. By: Fitzpatrick, John W. - Willard, David E.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 102
    Date: 1982
    Page Range: 153--158
    Publication Info: London, British Ornithologists' Club, 1893-