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- 461. ISBN 9783540002383. Butrica, Andrew J. (1996). To See the Unseen, A History of Planetary Radar Astronomy. NASA History Office. ISBN 978-0160485787....13 KB (1,356 words) - 09:26, 15 July 2024
- Washington, DC: National Aeronautics and Space Administration. p. 224. ISBN 978-0160485787. "Introduction to asteroid radar astronomy". Los Angeles, CA: University...32 KB (2,749 words) - 07:10, 31 August 2024