Columbia subject headings:
Harvard subject headings:
Administrative agencies--China--History.
China--History, Military.
China--History--Song dynasty, 960-1279.
China--History--Tang dynasty, 618-907.
Princeton subject headings:
Administrative agencies--China--History.
China--History, Military.
China--History--Song dynasty, 960-1279.
China--History--Tang dynasty, 618-907.