Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an American astronomer, astrophysicist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).
Below are papers obtained through the FOIA authored by Carl Sagan.
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The Radiation Balance of Venus, 15 September 1960 [30 Pages, 4.65mb]
https://documents.theblackvault.com/documents/space/TR32-34.pdf
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