"Traces the history of international broadcasting - broadcasting outside national frontiers - from the early days of radio to the present, with a look at the impact of these broadcasts and how they can be measured. The authors also examine some of the problems inherent in the practice, including jamming, and they consider the future of the medium. They explain that they have made the study as comprehensive as possible, but because of the wide range of the subject, the number of stations involved, and the difficulty in getting facts, there are inevitable omissions. There is a bibliography and an appendix, "Estimated Total Programme Hours Per Week of Some External Broadcasters." (Eleanor Blum, Frances G. Wilhoit: Mass media bibliography. 3rd ed. Urbana: University of Illinois Press, 1990 Nr. 539)