00622nam a2200193Ia 4500 CTU_86966 210402s9999 xx 000 0 und d 384 T274 Teletext and videotex in the United States : Market potential technology public policy issues John Tydeman ... [et al.] New York McGraw - Hill 1982 Teletext (data transmission system),Videotex (data transmission system) United states,United states Truc Trung tâm Học liệu Trường Đại học Cần Thơ