“Jack Parsons, John Whiteside “Jack” Parsons (born Marvel Whiteside Parsons October 2, 1914 – June 17, 1952”
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I came to the same information, undoubtedly for the same reason, while checking upon the death of a biographer of Robert Heinlein, William Patterson. Patterson wrote a two-part biography, and died the day the second part was published, April 22, 2014.
Interesting how much the paths of space, UFOs, and the occult cross.
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:^) One of the striking things about alien abduction is how it resembles fairy abduction in much older literature ("True Thomas" from the 13th c being the example that comes to mind; first ran across that in "The Worm Ourobouros" by E R Eddison).