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https://wattsupwiththat.com/2021/05/13/the-greatest-geomagnetic-storm-of-the-20th-centurymay-13-15-1921a-century-ago-new-york-city-new-york-state-were-especially-hard-hit/
The greatest geomagnetic storm of the 20th Century…May 13-15, 1921…a century ago, New York City/New York State were especially hard hit
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