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Entered into force October 30, 1968 for IV-20 thru IV-28, November 1, 1982 for IV-1 thru IV-11 and IV-13 thru IV-19.

Article IX, paragraph 4, of the Antarctic Treaty provides that recommended measures “shall become effective when approved by all the Contracting Parties whose representatives were entitled to participate in the meetings held to consider those measures.”

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U.S. Department of State

The Lessons of 1989: Freedom and Our Future