Columbia subject headings:
Harvard subject headings:
British Broadcasting Corporation--History.
Journalism--Germany--History--20th century.
Journalism--Great Britain--History--20th century.
Nordwestdeutscher Rundfunk--History.
Radio broadcasting--Germany--History--20th century.
Radio broadcasting--Great Britain--History--20th century.
World War, 1939-1945--Radio broadcasting and the war.
Princeton subject headings:
British Broadcasting Corporation--History.
Broadcasting--Germany--History--Sources.
Germany--History--1945-1955--Sources.
Nordwestdeutscher Rundfunk--History.