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- Nuclear Test Ban Treaty (1963)✖[remove]9
- Nuclear nonproliferation9
- Nuclear weapons9
- Treaty on the Non-proliferation of Nuclear Weapons (1968)✖[remove]9
- Great Britain8
- Soviet Union8
- Carter, Jimmy, 1924-7
- International Atomic Energy Agency7
Current results range from 1986 to 1987
- WGBH9