Columbia subject headings:
Collective farms--Soviet Union--History.
Industries--Soviet Union--History.
Soviet Union--Economic policy--1928-1932.
Harvard subject headings:
Collective farms--Soviet Union--History.
Industries--Soviet Union--History
Soviet Union--Economic policy--1928-1932.
Princeton subject headings:
Collective farms--Soviet Union--History.
Industries--Soviet Union--History.
Soviet Union--Economic policy--1928-1932.