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Intelligent Extraterrestrials. Oxford University Press US. p. 91. ISBN 978-0195171815. Silverberg, Robert (2005). Glenn Yeffeth (ed.). "Introduction". War...58 KB (6,862 words) - 11:30, 17 November 2024
intelligent extraterrestrials. New York: Oxford University Press. p. 52. ISBN 978-0195171815. Herschel, W. (1801). "Observations tending to investigate the nature...78 KB (8,486 words) - 04:57, 17 November 2024- Scientists on Intelligent Extraterrestrials, doi:10.1093/acprof:oso/9780195171815.003.0008 Clifford A. Pickover, The Stars of Heaven, Chapter 8: "Stellar...11 KB (1,228 words) - 06:24, 13 October 2024
Intelligent Extraterrestrials. Oxford University Press. pp. 148–149. ISBN 978-0195171815. Galántai, Zoltan (2003-09-07). "Long Futures and Type IV Civilizations"...140 KB (16,699 words) - 07:03, 8 November 2024
Intelligent Extraterrestrials. New York: Oxford University Press. ISBN 9780195171815. "A Barsoom Glossary Redmen of Mars". Erblist.com. Archived from the...82 KB (10,392 words) - 14:55, 7 November 2024- intelligent extraterrestrials. New York: Oxford University Press. p. 52. ISBN 9780195171815. mars.nasa.gov. "1800s | Mars Exploration Program". mars.nasa.gov. Archived...212 KB (20,667 words) - 07:34, 17 November 2024
