Before the 1963 Limited Test Ban Treaty, there were some very large atmospheric tests. The six largest were: October 23, 1961 (12.5 megatons);
October 30, 1961 (50 megatons); August 5, 1962 (21.1 megatons); September 25, 1962 (19.1 megatons); September 27, 1962 (greater than 10 megatons); and December 24, 1962 (24.2 megatons).
489 in Kazakhstan....
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http://www.thebulletin.org/article_n...ofn=mj98norris