Columbia subject headings:
Radio and music--Germany--North Rhein-Westfalia.
Radio broadcasting--Germany--North Rhein-Westfalia.
Westdeutscher Rundfunk--History.
Harvard subject headings:
Radio and music--Germany--North Rhine-Westphalia.
Radio broadcasting--Germany--North Rhine-Westphalia.
Westdeutscher Rundfunk--History.
Princeton subject headings:
Radio and music--Germany--North Rhein-Westfalia.
Radio broadcasting--Germany--North Rhein-Westfalia.
Westdeutscher Rundfunk--History.