Columbia subject headings:
China--Government policy.
China--History--Jiaqing, 1796-1820.
China--Politics and government.
Grain tribute (China)--History.
Grain--Transportation--China--History.
Inland water transportation--China--History.
Harvard subject headings:
China--Government policy.
China--History--Jiaqing, 1796-1820
China--Politics and government
Grain tribute (China)--History.
Grain--Transportation--China--History.
Inland water transportation--China--History.
Princeton subject headings: