Columbia subject headings:
Harvard subject headings:
Radio authorship--Germany--Congresses.
Radio broadcasting--Germany--Congresses.
Radio broadcasting--Germany--Public opinion--Congresses.
Radio broadcasting--Social aspects--Germany--Congresses.
Radio programs--Germany--Congresses.
Radio--Law and legislation--Germany--Congresses.
Princeton subject headings:
Broadcasting--Germany--Congresses.
Mass media--Political aspects--Congresses.