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Plumbbob Owens atomic test, 1957. US military aircraft observing the rising mushroom cloud from the Plumbbob Owens nuclear weapons test. This atomic bomb test took place on 25 July 1957, at the Nevada Test Site, USA. Codenamed Owens, it was the 11th test in the Operation Plumbbob series. The device was a boosted plutonium bomb. It was detonated from a balloon, and had a yield of 9.7 kilotons.
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