Columbia subject headings:
China--Defenses--History.
China--History--Ming dynasty, 1368-1644.
Great Wall of China (China)
Liaoning Sheng (China)--History, Military.
Harvard subject headings:
Princeton subject headings:
China--Defenses--History.
China--History--Ming dynasty, 1368-1644.
Great Wall of China (China)--History.
Liaoning Sheng (China)--History, Military.