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  1. By: Cottam, Clarence, - Kelso, Leon H. (Leon Hugh), - Ball, W H
    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, W H
    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