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  1. By: Knorr, Owen A
    Type: Article
    In: The Wilson bulletin
    Volume: 66
    Issue: 4
    Date: 1954
    Page Range: 264--264
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Knorr, Owen A
    Type: Article
    In: The Wilson bulletin
    Volume: 73
    Issue: 2
    Date: 1961
    Page Range: 155--170
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-