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}}</ref> It was adopted by United Nations General Assembly Resolution 2200A (XXI) on 16 December 1966 and entered into force 23 March 1976 after its thirty-fifth ratification or accession. (Article 49 allowed that the covenant would enter into force three months after the date of the deposit of the thirty-fifth instrument of ratification or accession.) As of September 2019, the Covenant has 173 parties and six more signatories without ratification, most notably the People's Republic of [[China ]] and Cuba;<ref>{{REFweb