Columbia subject headings:
Europe, Eastern--Politics and government--1945-
Socialism--Europe, Eastern--History--20th century.
Soviet Union--Politics and government--1985-1991.
Harvard subject headings:
Europe, Eastern--Politics and government--1945-
Europe, Eastern--Politics and government--1945-1989.
Socialism--Europe, Eastern--20th century.
Socialism--Europe, Eastern--History--20th century.
Soviet Union--Politics and government--1985-1991.
Princeton subject headings:
Europe, Eastern--Politics and government--1945-
Socialism--Europe, Eastern--History--20th century.
Soviet Union--Politics and government--1985-1991.