ADDITIONAL READING
American Geophysical Union: Scientific Results of the Viking Project, Journal of Geophysical Research 82, 1977, p. 3959.

Baker V.A.: The Channels of Mars, University of Texas Press, Austin, Texas, 1982.

Carr M.H.: The Surface of Mars, Yale University Press, New Haven, Conn., 1981.

Committee on Planetary and Lunar Exploration:: An Integrated Strategy for the Planetary Sciences: 1995-2010, National Research Council, Washington DC, 1994.

Greeley R. & Thomas P.E.: Mars Landing Site Catalog, 2nd Edition, NASA Reference Publication 1238, 1994.

Kieffer H.H., Jakosky B.M., Snyder C.W. and Matthews M.S. (eds): Mars, The University of Arizona Press, Tucson, Arizona, 1992.

Klein H.P. and DeVincenzi D.L.: Exobiological Exploration of Mars, Advances in Space Science, in press, 1995.

Margulis L., Mazur P., Barghoorn E., Halvorson H., Jukes T. and Kaplan I.: The Viking Mission: Implications for Life on Mars, Journal of Molecular Evolution, 14, 1979, p. 223.

McKay C.P. and Stoker C.R.: The Early Environment and its Evolution on Mars: Implications for Life, Reviews of Geophysics 27, 1989, p. 189.

Rummel J.D. and Meyer M.A.: A Consensus Approach to Planetary Protection Requirements: Recommendations for Mars Lander Missions, Advances in Space Research, in press, 1995.

Schopf J.W. (ed): The Earth's Earliest Biosphere: Its Origin and Evolution, Princeton University Press, Princeton, New Jersey, 1983.

Space Studies Board: The Search for Life's Origins: Progress and Future Directions in Planetary Biology and Chemical Evolution, National Research Council, Washington DC, 1990.

Space Studies Board: Biological Contamination of Mars: Issues and Recommendations, National Research Council, Washington DC, 1992.

Squyres S.W. and Kasting J.F. : Early Mars: How Warm and How Wet? Science 265, 1994, p. 744.

Walter M.R. and DesMarais D.J.: Preservation of Biological Information in Thermal Spring Deposits: Developing a Strategy for the Search for Fossil Life on Mars, Icarus 101, 1993, p. 129.

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