Columbia subject headings:
Antiquities, Prehistoric.
East Asia--Civilization.
Korea--Civilization--To 935.
Protohistory.
Harvard subject headings:
Princeton subject headings:
China--Civilization--221 B.C.-960 A.D.
China--Civilization--To 221 B.C.
Iron age--China.
Iron age--Europe.
Korea--Civilization--To 935.