Columbia subject headings:
Harvard subject headings:
China--History--To 221 B.C.--Congresses.
Song Mountain (China)--Civilization--Congresses.
Zhengzhou Shi (China)--History--Congresses.
Princeton subject headings:
China--History--To 221 B.C.--Congresses.
Song Mountain (China)--Civilization--Congresses.
Zhengzhou Shi (China)--History--Congresses.