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  1. By: Johnson, William P - Rohwer, Frank C
    Type: Article
    In: The Wilson bulletin
    Volume: 110
    Issue: 3
    Date: 1998
    Page Range: 311--315
    Publication Info: Columbus, Ohio Wilson Ornithological Society 1894-
  2. By: Garrettson, Pamela R. - Rohwer, Frank C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 2
    Date: 1998
    Page Range: 212--216
    Publication Info: Ottawa Ottawa Field-Naturalists' Club