Columbia subject headings:
Communism--Europe, Eastern--History--20th century.
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Politics and government--1989-
Harvard subject headings:
Communism--Europe, Eastern--History--20th century
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Politics and government--1989-
Princeton subject headings:
Communism--Europe, Eastern--History--20th century.
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Politics and government--1989-