New models for universal access to telecommunications services in Latin America / Peter A. Stern, David N. Townsend
Exposicion historica de las telecomunicaciones / org. Ministerio de Transportes, Turismo y Comunicaciones
O Porto e a electricidade / coord. Ana Cardoso de Matos
Results of different principles of legislation and administration in Europe; of the field as compared with competition within the field, of service / Edwin Chadwick