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Irma, numismatics, rare coins, slabbed coins, PCGS, NGC
Scroll down and read the comments from one fellow. I am no expert here, but if his observations and links are correct then the recent underground detonation by North Korea might have a yield of 300 kilotons. That is not trivial.
Scroll down and read the comments from one fellow. I am no expert here, but if his observations and links are correct then the recent underground detonation by North Korea might have a yield of 300 kilotons. That is not trivial.