ufofeed, https://www.ufofeed.com/74778/robert-heinlein-and-arthur-c-clarke-interview-with-walter-cronkite-july-20-1969/ Robert Heinlein and Arthur C. Clarke interview with Walter Cronkite, JULY 20, 1969 #Astrobiology #Astrophysics #Cosmology #PlanetaryScience #Space #SpaceExploration
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