Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--Politics and government--1945-1990
Germany (East)--Emigration and immigration.
Germany (East)--History.
Germany (West)--Emigration and immigration.
Germany (West)--History.
Political refugees--Germany (East)
Refugees--Germany (East)
Refugees--Germany (East)--History--20th century.
Refugees--Germany (West)
Princeton subject headings:
Berlin (Germany)--Politics and government--1945-1990.
Political refugees--Germany (East).
Refugees--Germany (East)--History--20th century.