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By: Rigby, S J - Britton, Donald M.Type: ArticleIn: The Canadian field-naturalistVolume: 84Series:Issue: 2Date: 1970Page Range: 137--144Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Rigby, S JType: ArticleIn: RhodoraVolume: 75Series:Issue:Date: 1973Page Range: 122--131Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]Subjects: