Complete proceedings of the World radio conventionm : held at Sydney, N.S.W., April 4th-14th, 1938 / Institution of Radio Engineer (Australia). Institution of radio engineers (Australia). Radio Congresses. TK6540 .W65 1938 621.38406 AUC Sydney : Institution of radio engineers, 1939. 1939. 1939 Text 556 p. : eng