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  1. By: Trapp, John L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 94
    Issue: 3
    Date: 1980
    Page Range: 349--349
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Trapp, John L
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 3
    Date: 1979
    Page Range: 412--419
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-