Columbia subject headings:
Harvard subject headings:
China--History--221 B.C.-960 A.D.
China--History--960-1644.
China--History--To 221 B.C.
Princeton subject headings:
China--History--221 B.C.-960 A.D.
China--History--960-1644.
China--History--To 221 B.C.
Sima, Guang, 1019-1086. Zi zhi tong jian.