Mariner 9 television reconnaissance of Mars and its satellites: Preliminary results Hanel, R. A. ; Conrath, B. J. ; Hovis, W. A. ; Kunde, V. G. ; Lowman, P. D. ; Pearl, J. C. ; Prabhakara, C. ; Schlachman, B. ; Levin, G. V. Abstract Publication: Science Pub Date: January 1972 Bibcode: 1972Sci...175..294H