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Helsinki: Suomalainen Tiedeakatemia, 1957
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Düsseldorf; Köln: Diederichs, 1964
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JSTOR, 1968
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University of Illinois Press, 1966
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JSTOR, 1966
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University of Illinois Press, 1959
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JSTOR, 1968
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University of Illinois Press, 1956
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University of Chicago Press, 1974
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University of Chicago Press, 1974
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University of Illinois Press, 1964
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JSTOR, 1966
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University of Illinois Press, 1959