Columbia subject headings:
Harvard subject headings:
China--Politics and government--221 B.C.-220 A.D.--Early works to 1800.
Government monopolies--China--Early works to 1800.
Iron industry and trade--China--Early works to 1800.
Salt industry and trade--China--Early works to 1800.
Princeton subject headings:
China--Politics and government--221 B.C.-220 A.D.--Early works to 1800.
Government monopolies--China--Early works to 1800.
Iron industry and trade--China--Early works to 1800.
Salt industry and trade--China--Early works to 1800.