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Theory of Knowledge 1989, Prentice Hall

ISBN-13: 9780139141775

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Theory of Knowledge 1988, Prentice-Hall, Harlow

ISBN-13: 9780139141850

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Theory of Knowledge 1977, Prentice Hall, Englewood Cliffs, NJ

ISBN-13: 9780139141508

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Theory of Knowledge 1977, Prentice Hall

ISBN-13: 9780139141683

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Theory of Knowledge 1967, Prentice Hall, New Jersey

ISBN-13: 9780139140020

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