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Stadtbergen: Verl. Quid Verum, 1999
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Springer Science and Business Media LLC, 1968
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Springer Science and Business Media LLC, 1968
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Wiley, 1968
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Springer Science and Business Media LLC, 1967
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Walter de Gruyter GmbH, 1966
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Springer Science and Business Media LLC, 1962
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Association for Symbolic Logic, Inc., 1939
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Verein philosophie.ch, 1974
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Springer Science and Business Media LLC, 1934
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Springer Science and Business Media LLC, 1934
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Philosophy Documentation Center, 1935
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JSTOR, 1937