Columbia subject headings:
Agriculture and state--China.
Agriculture--China.
Agriculture--Economic aspects--China.
Food supply--China.
Grain--China.
Harvard subject headings:
Agriculture and state--China.
Agriculture--China
Agriculture--Economic aspects--China
Food supply--China
Grain--China.
Princeton subject headings:
Agriculture and state--China.
Agriculture--China.
Agriculture--Economic aspects--China.
Food supply--China.
Grain--China.