General radiocommunication regulations : annexed to the International Telecommunication Convention : final protocol to the general radiocommunication regulations : additional radiocommunication regulations annexed to the International Telecommunication Convention : addition protocol to the acts of the International Radiotelegraph Conference of Madrid, signed by the governments of the European region : Madrid 1932 - International Radiotelegraph Conference; Great Britain. Post Office (H.M.S.O., 1933)