Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Civilization--20th century.
Nineteen ninety, A.D.
Soviet Union--Civilization.
Soviet Union--History--1985-1991.
Soviet Union--Politics and government--1985-1991.
Soviet Union--Social conditions.
Princeton subject headings:
Europe, Eastern--Civilization--20th century.
Nineteen ninety, A.D.
Soviet Union--Civilization--20th century.
Soviet Union--History--1985-1991.