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  1. By: Johnsgard, Paul A - Wood, Robert E
    Type: Article
    In: The Wilson bulletin
    Volume: 80
    Issue: 2
    Date: 1968
    Page Range: 173--188
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Timm, Daniel E. - Morgan, Sidney O. - Wood, Robert E
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 3
    Date: 1975
    Page Range: 322--322
    Publication Info: Ottawa Ottawa Field-Naturalists' Club