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By: Johnston, Earl SType: ArticleIn: American journal of botanyVolume: 6Series:Issue: 9Date: 1919-11Page Range: 373--379Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-Subjects:
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By: Johnston, Earl SType: ArticleIn: Botanical gazetteVolume: 74Series:Issue: 3Date: 1922Page Range: 314--319Publication Info: Hanover, Ind, [publisher not identified], 1876-1991Subjects:
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By: Johnston, Earl SType: ArticleIn: American journal of botanyVolume: 9Series:Issue: 3Date: 1922-03Page Range: 93--98Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-Subjects: