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By: Sheppard, David H - Klopfer, Peter H - Oelke, HansType: ArticleIn: The Wilson bulletinVolume: 80Series:Issue: 4Date: 1968Page Range: 452--457Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Sheppard, David H - Swanson, Stella M.Type: ArticleIn: The Canadian field-naturalistVolume: 90Series:Issue: 2Date: 1976Page Range: 170--172Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: