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By: Igl, Lawrence D - Johnson, Douglas HType: ArticleIn: The Canadian field-naturalistVolume: 121Series:Issue: 3Date: 2007-07-01Page Range: 239--255Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Johnson, Douglas H - Igl, Lawrence DType: ArticleIn: The Wilson bulletinVolume: 107Series:Issue: 4Date: 1995Page Range: 709--718Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Johnson, Douglas H - Stewart, Robert E.Type: ArticleIn: The Wilson bulletinVolume: 85Series:Issue: 2Date: 1973Page Range: 148--162Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Igl, Lawrence D - Johnson, Douglas H - Kantrud, Harold A.Type: ArticleIn: The Canadian field-naturalistVolume: 113Series:Issue: 4Date: 1999Page Range: 646--651Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: