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By: MacLachlan, J. D. - Crowell, Ivan HType: ArticleIn: Journal of the Arnold ArboretumVolume: 18Series:Issue: 2Date: 1937Page Range: 149--163Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-Subjects:
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By: Crowell, Ivan HType: ArticleIn: Journal of the Arnold ArboretumVolume: 16Series:Issue: 4Date: 1935Page Range: 367--410Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-Subjects:
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By: Crowell, Ivan HType: ArticleIn: Journal of the Arnold ArboretumVolume: 15Series:Issue: 3Date: 1934Page Range: 163--232Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-Subjects:
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By: Crowell, Ivan HType: ArticleIn: Journal of the Arnold ArboretumVolume: 17Series:Issue: 1Date: 1936Page Range: 50--51Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-Subjects: