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14. See, for example, D.S. McKay, E.K. Gibson Jr., K.L. Thomas-Keprt, H. Vali, C.S. Romanek, S.J. Clemett, X.D.F. Chillier, C.R. Maechling, and R.N. Zare, "Search for Past Life on Mars: Possible Relic Biogenic Activity in Martian Meteorite ALH 84001," Science 273:924-930, 1996.

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25. See, for example, National Research Council, Assessment of Mars Science and Mission Priorities, The National Academies Press, Washington, D.C., 2001, pp. 101-102.

26. For additional details see, for example, National Research Council, Preventing the Forward Contamination of Mars, The National Academies Press, Washington, D.C., 2006.

27. For additional details see, for example, National Research Council, Mars Sample Return: Issues and Recommendations, National Academy Press, Washington, D.C., 1997.

28. See, for example, M.J. Daly, "Deinococcus radiodurans as an Analogue to Extremophile Organisms That May Have Survived on Mars," pp. 67-69 in National Research Council, The Quarantine and Certification of Martian Samples, National Academy Press, Washington, D.C., 2002.

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