Columbia subject headings:
Europe, Eastern--Economic conditions.
Europe, Eastern--Social conditions.
Social classes--Europe, Eastern.
Socialism--Europe, Eastern.
Harvard subject headings:
Europe, Eastern--Economic conditions.
Europe, Eastern--Social conditions.
Social classes--Europe, Eastern
Socialism--Europe, Eastern
Princeton subject headings:
Europe, Eastern--Economic conditions.
Europe, Eastern--Social conditions.
Social classes--Europe, Eastern.
Socialism--Europe, Eastern.