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  1. By: North, George W
    Type: Article
    In: The Canadian field-naturalist
    Volume: 47
    Issue: 3
    Date: 1933-03
    Page Range: 59--59
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Speirs, J Murray - North, George W - Crosby, John A
    Type: Article
    In: The Wilson bulletin
    Volume: 56
    Issue: 4
    Date: 1944
    Page Range: 206--208
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-