Columbia subject headings:
Russia--Social conditions--1801-1917.
Russia--Social conditions--To 1801.
Working class--Soviet Union--History.
Harvard subject headings:
Labor movement--Soviet Union--History.
Russia--Social conditions--1801-1917.
Russia--Social conditions--To 1801.
Working class--Soviet Union--History
Princeton subject headings:
Labor movement--Soviet Union--History.
Russia--Social conditions--1801-1917.
Russia--Social conditions--To 1801.
Working class--Soviet Union--History.