Columbia subject headings:
Social classes--Soviet Union.
Socialism--China.
Socialism--Soviet Union.
Socialism.
Soviet Union--Social conditions.
Harvard subject headings:
Social classes--Soviet Union
Socialism--China
Socialism--Soviet Union
Socialism.
Soviet Union--Social conditions--1917-1945.
Soviet Union--Social conditions.
Princeton subject headings:
Social classes--Soviet Union.
Socialism--China.
Socialism--Soviet Union.
Socialism.
Soviet Union--Social conditions.