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- exploration: human pioneers and robotic surveyors. Springer. pp. 39–40. ISBN 9781852337469. "Fifth Semiannual Report to Congress". May 28, 2962. NASA. p. 50. Retrieved...4 KB (428 words) - 03:46, 22 August 2022
- Robotic Surveyors. Springer Science & Business Media. p. 8. ISBN 978-1-85233-746-9. Schmadel, Lutz (2003-08-05). Dictionary of Minor Planet Names. Springer...9 KB (1,284 words) - 02:23, 23 January 2023
- OCLC 26764320. Ulivi, Paolo; Harland, David Michael (2004). Lunar Exploration: Human Pioneers and Robotic Surveyors. Springer. ISBN 978-1-85233-746-9....19 KB (2,156 words) - 22:44, 24 October 2023