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  1. By: Chamberlain, Michael J - Leopold, Bruce D
    Type: Article
    In: The Wilson bulletin
    Volume: 112
    Issue: 3
    Date: 2000
    Page Range: 326--331
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Van Why, Kyle R. - Chamberlain, Michael J
    Type: Article
    In: The Canadian field-naturalist
    Volume: 117
    Issue: 1
    Date: 2003-01-01
    Page Range: 113--115
    Publication Info: Ottawa Ottawa Field-Naturalists' Club