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Washington, DC, 1941 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2008
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Washington, DC, 1937 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Wiley, 1983
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International Bureau for Plant Taxonomy and Nomenclature, 1983
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Wiley, 1975
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International Bureau for Plant Taxonomy and Nomenclature, 1975
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International Bureau for Plant Taxonomy and Nomenclature, 1975
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International Bureau for Plant Taxonomy and Nomenclature, 1959
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Wiley, 1959
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New England Botanical Club, 1957
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Wiley, 1958
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International Bureau for Plant Taxonomy and Nomenclature, 1958
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Wiley, 1956
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International Bureau for Plant Taxonomy and Nomenclature, 1956
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Wiley, 1954
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International Bureau for Plant Taxonomy and Nomenclature, 1954
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Wiley, 1954
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International Bureau for Plant Taxonomy and Nomenclature, 1954
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Wiley, 1953
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International Bureau for Plant Taxonomy and Nomenclature, 1953