Columbia subject headings:
Agriculture--Economic aspects--Soviet Union.
Agriculture--Soviet Union.
Wheat trade--Soviet Union.
Wheat--Soviet Union.
Harvard subject headings:
Agriculture--Economic aspects--Soviet Union
Agriculture--Soviet Union
Wheat trade--Soviet Union.
Wheat--Soviet Union.
Princeton subject headings:
Agriculture--Economic aspects--Soviet Union.
Agriculture--Soviet Union.
Wheat trade--Soviet Union.
Wheat--Soviet Union.