Columbia subject headings:
Soviet Union--Economic policy--1917-1928.
Soviet Union--Economic policy--1928-1932.
Harvard subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1917-1928.
Soviet Union--Economic policy--1928-1932.
Princeton subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1917-1928.
Soviet Union--Economic policy--1928-1932.