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  1. By: Mueller, Helmut C - Berger, Daniel D. - Allez, George
    Type: Article
    In: The Wilson bulletin
    Volume: 93
    Issue: 4
    Date: 1981
    Page Range: 491--499
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Mueller, Helmut C - Mueller, Nancy S - Berger, Daniel D. - Allez, George - Robichaud, William - Kaspar, John L
    Type: Article
    In: The Wilson bulletin
    Volume: 112
    Issue: 2
    Date: 2000
    Page Range: 214--224
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-