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Jena: Fischer, 1927
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SAGE Publications, 1934
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SAGE Publications, 1934
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SAGE Publications, 1932
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SAGE Publications, 1932
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SAGE Publications, 1931
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Duke University Press, 1931
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SAGE Publications, 1931
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Duke University Press, 1931
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SAGE Publications, 1929
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SAGE Publications, 1929
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SAGE Publications, 1929
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SAGE Publications, 1928
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SAGE Publications, 1928
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SAGE Publications, 1929
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SAGE Publications, 1928
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SAGE Publications, 1928
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SAGE Publications, 1929
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University of California Press, 1927
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University of California Press, 1927