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  1. By: Volkman, Nicholas J - Trivelpiece, Wayne
    Type: Article
    In: The Wilson bulletin
    Volume: 93
    Issue: 2
    Date: 1981
    Page Range: 243--248
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Volkman, Nicholas J - Ralls, Katherine
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society
    Volume: 58
    Date: 1973
    Page Range: 55--57
    Publication Info: New York,