Columbia subject headings:
Broadcasting--Germany--Hamburg--History--20th century.
Hamburg (Germany)--History--20th century.
Mass media--Germany--Hamburg--History--20th century.
Press and politics--Germany--Hamburg--History--20th century.
Press--Germany--Hamburg--History--20th century.
Harvard subject headings:
Journalism--Germany--Hamburg--History--20th century.
Mass media--Germany--Hamburg--History--20th century.
Mass media--Social aspects--Germany--Hamburg--History--20th century.
Princeton subject headings: