Set Theory An Introduction to Independence Proofs, by Kenneth Kunen

An Introduction to Decision Theory (Cambridge Introductions to Philosophy)

An Introduction to Probability Theory and Its Applications Vol 1 -6th Print 1961

An Introduction to the Theory of Differential Equations HC Leighton

An Introduction to Information Theory

An introduction to number theory (Markham mathematics series)

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An Elementary Introduction to the Theory of Probability (1961)