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By: Crowder, A. A. - Topping, J. - Garwood, A. E. - Handford, M. - Vardy, C. - Bretzke, H.Type: ArticleIn: The Canadian field-naturalistVolume: 106Series:Issue: 2Date: 1992Page Range: 272--277Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: