For Further Information

Ley, W.; von Braun, W.; and Bonestell, C.: The Exploration of Mars. The Viking Press, 1956.

Loomis, A. A.: Some Geologic Problems of Mars.

Geol. Soc. Am. Bull., vol. 76, 1965, p. 1083. Michaux, C. M.: Handbook of the Physical Properties of the Planet Mars. NASA SP-3030, 1967. £>pik, E. J.: Atmosphere and Surface Properties of Mars and Venus. Progr. Astronaut. Sci., vol. 1, 1962, p. 261.

Pollack, J. B.; and Sagan, C.: An Analysis of Martian Photometry and Polarimetry. Smithsonian Astrophys. Obs. Spec. Rept. 258, 1967. Vaucouleurs, G. de: Geometric and Photometric Parameters of the Terrestrial Planets. Icarus, vol. 3, 1964, p. 187. Wells, R. A.: A Re-evaluation of W. H. Wright's Plates of the 1924 and 1926 Oppositions of Mars. Planetary and Space Sci., vol. 13, 1965, p. 361.

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