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Russell, Bertrand, Murray, Gilbert, Clark, G.N. (). The problems of philosophy . London: Oxford University Press.

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Russell, Bertrand, Murray, Gilbert, Clark, G.N. The problems of philosophy. London: Oxford University Press, . Text.

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Russell, Bertrand, Murray, Gilbert, Clark, G.N. The problems of philosophy. London: Oxford University Press, . Text.

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Russell, Bertrand, Murray, Gilbert, Clark, G.N. The problems of philosophy. London: Oxford University Press, . Print.