1977 – The Kelly Barnes Dam, located above Toccoa Falls Bible College near Toccoa, Georgia, fails, killing 39.
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1971 – The United States Atomic Energy Commission tests the largest U.S. underground hydrogen bomb, code-named Cannikin, on Amchitka Island in the Aleutians.
1944 – Plutonium is first produced at the Hanford Atomic Facility and subsequently used in the Fat Man atomic bomb dropped on Nagasaki, Japan.
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