Columbia subject headings:
Harvard subject headings:
China--Politics and government--221 B.C.-220 A.D.
Government monopolies--China.
Huan, Kuan, active 1st century B.C. Yan tie lun.
Iron industry and trade--Government ownership--China.
Salt industry and trade--Government ownership--China.
Princeton subject headings:
China--Politics and government--221 B.C.-220 A.D.
Huan, Kuan, active 1st century B.C. Yan tie lun.