00647nas a22002171 4500 1/51019 021010c19819999enkqrzp a0eng d 0261-6777 24017 Αλφαβητική σειρά Ocean Voice London : INMARSAT, 1981- v. : ill. ; 30 cm. Quarterly 1999 English Artificial satellites in navigation Periodicals. Artificial satellites in telecommunication Periodicals. http://uclibs.org/PID/19416 ΑΡΧΕΙΟ ΠΕΡΙΟΔΙΚΩΝ 514 1999 Main run