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Philadelphia: Lea & Febiger, 1977
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American Association for the Advancement of Science (AAAS), 1964
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American Association for the Advancement of Science (AAAS), 1964
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American Association for the Advancement of Science, 1964
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University of Chicago Press, 1959
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University of Chicago Press, 1959
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Informa UK Limited, 1959
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Informa UK Limited, 1959
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New York Botanical Garden, 1959
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JSTOR, 1961
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Informa UK Limited, 1960
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Informa UK Limited, 1960
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New York Botanical Garden, 1960
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Informa UK Limited, 1961
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Informa UK Limited, 1961
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New York Botanical Garden, 1961
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JSTOR, 1960
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American Institute of Biological Sciences, 1959
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American Institute of Biological Sciences, 1959
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JSTOR, 1958