Columbia subject headings:
Berlin (Germany)--History--1945-1990.
Berlin (Germany)--International status.
Quadripartite Agreement on Berlin
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Berlin (Germany)--International status
Quadripartite Agreement on Berlin
Princeton subject headings:
Berlin (Germany)--History--1945-1990.
Berlin (Germany)--International status.
Berlin (Germany)--Politics and government--1945-1990.
Quadripartite Agreement on Berlin