What collection of papers by a Russian-British social and political theorist appeared in 1969?
Two Concepts of Liberty: "Two Concepts of Liberty" was the inaugural lecture delivered by the liberal philosopher Isaiah Berlin before the University of Oxford on 31 October 1958. Two Concepts of Liberty:  It also appears in the collection of Berlin's papers entitled "Four Essays on Liberty" (1969) and was more recently reissued in a collection entitled simply "Liberty" (2002).
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