Columbia subject headings:
Industrial relations--Soviet Union--History.
Industries--Soviet Union--History--20th century.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy.
Working class--Soviet Union--History--20th century.
Harvard subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1917-1928.
Working class--Soviet Union--History--20th century.
Princeton subject headings:
Industrial relations--Soviet Union--History--1925-1953.
Industries--Soviet Union--History--20th century.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy.
Working class--Soviet Union--History.