1. | Maintenance of international sound-programme and television transmission circuits : series N recommendations / International Telecommunication UnionData Publicação: 1989 Tema: Vária | ![]() | |
2. | Final acts : of the Regional Administrative Conference for the Planning of VHF/UHF Television Broadcasting Area and Neighbouring Countries: Geneva, 1989 / International Telecommunication UnionData Publicação: 1989 Tema: UIT-União Internacional das Telecomunicações | ![]() |