Columbia subject headings:
Harvard subject headings:
China--Civilization--To 221 B.C.
Gansu Sheng (China)--Civilization.
Shaanxi Sheng (China)--Civilization.
Princeton subject headings:
China--Civilization--To 221 B.C.
Gansu Sheng (China)--Civilization.
Shaanxi Sheng (China)--Civilization.