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  1. By: Crawford, Richard D
    Type: Article
    In: The Wilson bulletin
    Volume: 89
    Issue: 1
    Date: 1977
    Page Range: 73--80
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Azure, David A. - Naugle, David E. - Toepfer, John E. - Huschle, Gary - Crawford, Richard D
    Type: Article
    In: The Canadian field-naturalist
    Volume: 114
    Issue: 2
    Date: 2000
    Page Range: 307--310
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Crawford, Richard D
    Type: Article
    In: The Wilson bulletin
    Volume: 90
    Issue: 4
    Date: 1978
    Page Range: 536--543
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-