Columbia subject headings:
Harvard subject headings:
Archaeology--China
China--Civilization--221 B.C.-960 A.D.
China--Civilization--To 221 B.C.
Iron-works--China--History.
Princeton subject headings:
China--History--Han dynasty, 202 B.C.-220 A.D.
China--History--Qin dynasty, 22-207 B.C.
Metal-work--China--History.
Metal-work--China--Technology.