Columbia subject headings:
Harvard subject headings:
China--History--Liao dynasty, 947-1125
China--History--Northern Wei dynasty, 386-534.
Mongols--History
Princeton subject headings:
China--History--Liao dynasty, 947-1125.
China--History--Northern Wei dynasty, 386-534.
China--History--Northern and Southern dynasties, 386-589.
Ethnology--China--History.