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St. Paul, Minn.: APS Press, 1999
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Minneapolis, Minn.: Burgess Publishing Co., 1972
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New York [u.a.]: McGraw-Hill, 1951
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Informa UK Limited, 1945
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Informa UK Limited, 1945
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New York Botanical Garden, 1945
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Informa UK Limited, 1943
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Informa UK Limited, 1943
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New York Botanical Garden, 1943
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Informa UK Limited, 1937
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Informa UK Limited, 1937
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New York Botanical Garden, 1937
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New York Botanical Garden, 1989
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Informa UK Limited, 1989
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Springer Science and Business Media LLC, 1989