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Periodical. Sagan, Carl, Joseph Veverka, Paul Fox, Russell Dubisch, Joshua Lederberg, Elliott C. Levinthal, Lynn Quam, R. B. Tucker, J. B. Pollack, and Bradford A. Smith. "Variable Features on Mars: Preliminary Mariner 9 Television Results." Icarus 17, (1972): 346-372. Article. 27 Images.. Icarus. Lederberg UI. P211