Columbia subject headings:
Harvard subject headings:
Acoustical engineering--Germany--Berlin--History.
Haus des Rundfunks (Berlin, Germany)--History.
Radio broadcasting--Germany--Berlin--History.
Radio stations--Germany--Berlin--History.
Princeton subject headings:
Acoustical engineering--Germany--Berlin--History.
Haus des Rundfunks (Berlin, Germany)--History.
Radio broadcasting--Germany--Berlin--History.
Radio stations--Germany--Berlin--History.