Dai messaggi di mosé alle comunicazioni laser / Museo Storico delle Poste e delle Telecomunicazioni
Deregulation of the radio spectrum in the UK / C S P International
Radio database international : news, entertainment & live coverage of unfolding events from every corner of the world: 1987 buyer's guide to world-band radios / International Broadcasting Services, Ltd.
Robôs e computadores / Nigel Hawkes
Rádio propaganda / Jaroslav Smit