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Nuclear Weapons of the Atomic AgeUnited Nations (New York), 1975Cover with a stamp commemorating the 30th anniversary of the United Nations and an Official United Nations Cachet. With a special non-proliferation cancellation depicting a nuclear blast that is crossed out. Postmarked on October 24, 1975.Central African Republic, 2018Miniature Sheet with four stamps commemorating the 55th Anniversary of the Death of John F. Kennedy, with one stamp depicting a nuclear blast in the background. Issued on July 17.
