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April 1, 2018. Sagan, Carl (1985). Cosmos. Balantine Books. p. 3. ISBN 0345331354. "Star survey reaches 70 sextillion: And that's only the stars we can...152 KB (15,303 words) - 22:23, 9 November 2024
Cosmos (1st Ballantine books ed.). New York, NY: Ballantine Books. ISBN 0-345-33135-4. OCLC 12814276. Angelo, Joseph A., 2004, Nuclear Technology, Greenwood...53 KB (7,617 words) - 23:21, 4 October 2024
