Columbia subject headings:
Agriculture and state--Soviet Union.
Agriculture--Economic aspects--Soviet Union--Statistics.
Agriculture--Economic aspects--Soviet Union.
Collectivization of agriculture--Soviet Union.
Kondratʹev, N. D. (Nikolaĭ Dmitrievich), 1892-1938--Correspondence.
Soviet Union--Economic policy.
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Economics
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1917-1928.
Soviet Union--Economic policy--1928-1932.
Princeton subject headings: