Columbia subject headings:
Berlin (Germany)--History--20th century.
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Berlin (Germany)--History--1990-
Berlin (Germany)--History--20th century.
Berlin (Germany)--Politics and government--1945-1990
Berlin (Germany)--Politics and government--1990-
Princeton subject headings:
Berlin (Germany)--History.