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Stuttgart: Klett, 1947
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Madison, Wisc. [u.a.]: Univ. of Wisc. Press, 1980
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New York: Octagon Books, 1973
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Gloucester, Mass.: Smith, 1962
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New York [u.a.]: Scribner, 1935
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JSTOR, 1936
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The Johns Hopkins Press, 1936
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JSTOR, 1930
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SAGE Publications, 1947
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Oxford University Press (OUP), 1931
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Oxford University Press (OUP), 1932