What collection of papers by a Russian-British social and political theorist appeared in 1969?
Two Concepts of Liberty:  It was subsequently published as a 57-page pamphlet by Oxford at the Clarendon Press. 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).
i don't know