On a clear day, a 10,000 Mt bomb, at the right altitude, could incinerate an area with a radius of +320 miles. Fun.pic.twitter.com/nXuDkgQPBs
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Passel 1963: http://www.dtic.mil/dtic/tr/fulltext/u2/404590.pdf … ; the screenshotted graph is from Rogers & Miller 1963: http://www.dtic.mil/dtic/tr/fulltext/u2/a383988.pdf …