Columbia subject headings:
Harvard subject headings:
China--History--Han dynasty, 202 B.C.-220 A.D.
Iron industry and trade--China--History.
Princeton subject headings:
China--Antiquities.
China--History--Han dynasty, 202 B.C.-220 A.D.
Government monopolies--China--History.
Industrial policy--China--History.
Iron industry and trade--China--History.