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  1. By: Field, Rebecca - North, Michael R - Wells, Judith
    Type: Article
    In: The Wilson bulletin
    Volume: 105
    Issue: 2
    Date: 1993
    Page Range: 325--332
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: North, Michael R - Ryan, Mark R
    Type: Article
    In: The Canadian field-naturalist
    Volume: 102
    Issue: 3
    Date: 1988
    Page Range: 485--490
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: North, Michael R - Ryan, Mark R
    Type: Article
    In: The Canadian field-naturalist
    Volume: 102
    Issue: 1
    Date: 1988
    Page Range: 69--70
    Publication Info: Ottawa Ottawa Field-Naturalists' Club