Columbia subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1917-1928.
Working class--Russia (Federation)--Tatarstan--History.
Working class--Soviet Union--History.
Working class--Soviet Union--Statistics.
Harvard subject headings:
Princeton subject headings:
Budgets, Personal--Soviet Union.
Employees--Social conditions--Soviet Union.
Working class--Research--Soviet Union.