Columbia subject headings:
Harvard subject headings:
China--Ethnic relations.
China--Foreign relations.
China--History--221 B.C.-960 A.D.
China--History--Song dynasty, 960-1279.
Minorities--China.
Princeton subject headings:
China--Ethnic relations.
China--Foreign relations.
China--History--221 B.C.-960 A.D.
China--History--Song dynasty, 960-1279.
Minorities--China.