12. Paul D. Spudis and G. Jeffrey Taylor, “The Roles of Humans and Robots as Field Geologists on the Moon,” Lunar Bases and Space Activities of the 21st Century, 2nd Symposium, LPI Contribution 652, Lunar and Planetary Institute, Houston, Texas, 1990.

13. Aeronautics and Space Engineering Board, Committee on Advanced Space Technology, , Space Technology to Meet Future Needs, National Academy Press, Washington, D.C., 1987.

14. Space Studies Board, Aeronautics and Space Engineering Board, Committee on Space Science Technology Planning,, Improving NASA's Technology for Space Science, National Academy Press, Washington, D.C., 1993.



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