Columbia subject headings:
Agriculture--Economic aspects--Soviet Union--Congresses.
Irrigation--Soviet Union--Congresses.
Land use--Soviet Union--Planning--Congresses.
Harvard subject headings:
Food supply--Soviet Union--Congresses.
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--Congresses.
T︠S︡K KPSS--Congresses.
Princeton subject headings: