Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--History--20th century.
Communism--Yugoslavia--History--20th century.
Socialism--Soviet Union--History--20th century.
Socialism--Yugoslavia--History--20th century.
Soviet Union--Economic conditions.
Soviet Union--Social conditions.
Yugoslavia--Economic conditions--20th century.
Yugoslavia--Social conditions--20th century.
Princeton subject headings:
Communism--History--20th century.
Communism--Soviet Union--History--20th century.
Communism--Yugoslavia--History.
Socialism--History--20th century.
Soviet Union--Economic conditions--1976-.
Soviet Union--Social conditions--1970-.
Yugoslavia--Economic conditions.
Yugoslavia--Politics and government.
Yugoslavia--Social conditions.