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  1. By: Bergin, Timothy M - Best, Louis B - Freemark, Kathyrn E
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 3
    Date: 1997
    Page Range: 437--448
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Boutin, Celine - Freemark, Kathyrn E - Kirk, David Anthony
    Type: Article
    In: The Canadian field-naturalist
    Volume: 113
    Issue: 3
    Date: 1999
    Page Range: 430--460
    Publication Info: Ottawa Ottawa Field-Naturalists' Club