A more scholarly treatment is the 2012 book The Visioneers by historian W. Patrick McCray.
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In 1986 the Society, which had grown to about 10,000 members, merged with the 25,000 member National Space Institute, founded by German rocket engineer and Project Apollo program manager Wernher von Braun of NASA's Marshall Space Flight Center to form the present-day National Space Society.
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In August 1975, Meinel co-founded (with her then-husband, Keith Henson) the L5 Society, since merged into the National Space Society, and was its president for several years.
The National Space Society was established in the United States on March 28, 1987, by the merger of the National Space Institute, founded by Dr. Wernher von Braun, and the L5 Society, based on the concepts of Dr. Gerard K. O'Neill.