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  1. By: Delotelle, Roy S - Epting, Robert J - Newman, James R
    Type: Article
    In: The Wilson bulletin
    Volume: 99
    Issue: 2
    Date: 1987
    Page Range: 202--217
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Delotelle, Roy S - Epting, Robert J
    Type: Article
    In: The Wilson bulletin
    Volume: 104
    Issue: 2
    Date: 1992
    Page Range: 285--294
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-