Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Germany (East)--History.
Public libraries--Administration--Political aspects.
Public libraries--Germany (East)--History--20th century.
Public libraries--Political aspects--Germany (East)
Public libraries--Political aspects--Soviet Union.
Public libraries--Soviet Union--History--20th century.
Princeton subject headings:
Public libraries--Germany (East)--History.
Special libraries--Germany (East)--History.