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  1. By: Robins, C. Richard - Heed, William B
    Type: Article
    In: The Wilson bulletin
    Volume: 63
    Issue: 4
    Date: 1951
    Page Range: 263--270
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Martin, Paul S. (Paul Schultz), - Robins, C. Richard - Heed, William B
    Type: Article
    In: The Wilson bulletin
    Volume: 66
    Issue: 1
    Date: 1954
    Page Range: 38--57
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-