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  1. By: Hein, Dale - Haugen, Arnold O
    Type: Article
    In: The Wilson bulletin
    Volume: 78
    Issue: 3
    Date: 1966
    Page Range: 301--308
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Martin, Elwood M - Haugen, Arnold O
    Type: Article
    In: The Wilson bulletin
    Volume: 72
    Issue: 3
    Date: 1960
    Page Range: 238--243
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-