Columbia subject headings:
Labor supply--Soviet Union.
Professions--Soviet Union.
Soviet Union--Census, 1926.
Soviet Union--Economic policy--1917-1928.
Harvard subject headings:
Labor supply--Soviet Union.
Professions--Soviet Union.
Soviet Union--Census, 1926.
Soviet Union--Economic policy--1917-1928.
Working class--Soviet Union--Statistics.
Princeton subject headings:
Labor--Soviet Union--Statistics.