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↑ Unmanned Spaceflight.com > Viking sols?
↑ D. J. Mudgway (1983) (PDF). Telecommunications and Data Acquisition Systems Support for the Viking 1975 Mission to Mars. NASA Jet Propulsion Laboratory. http://www.atmos.washington.edu/~mars/LFEM/lfemstep/lfemstep_slides/viking_documents/Pdf/JPL_Publication_82-107.pdf.