Columbia subject headings:
Harvard subject headings:
China--History--Liao dynasty, 947-1125
Gunpowder--History
Khitan (Chinese people)
Uighur language.
Xuanzang, approximately 596-664
Princeton subject headings:
China--History--Liao dynasty, 947-1125.
Gunpowder--History.
Khitan (Chinese people)
Uighur language.
Xuanzang, approximately 596-664.