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  1. By: Cottam, Clarence, - Kelso, Leon H. (Leon Hugh), - Ball, William Howard.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 45
    Date: 1932
    Page Range: 207--207
    Publication Info: Washington, Biological Society of Washington,
  2. By: Ball, William Howard.
    Type: Article
    In: The Wilson bulletin
    Volume: 41
    Issue: 3
    Date: 1929
    Page Range: 190--190
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Ball, William Howard.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 45
    Date: 1932
    Page Range: 165--166
    Publication Info: Washington, Biological Society of Washington,