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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Balph, Martha Hatch
    Type: Article
    In: The Wilson bulletin
    Volume: 87
    Issue: 2
    Date: 1975
    Page Range: 207--230
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Weitzman, Stanley H. - Balph, Martha Hatch
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 92
    Date: 1980
    Page Range: 10--22
    Publication Info: Washington, Biological Society of Washington,