Columbia subject headings:
Harvard subject headings:
China--History--Tang dynasty, 618-907.
Xi'an (Shaanxi Sheng, China)--Antiquities.
Xi'an (Shaanxi Sheng, China)--History.
Princeton subject headings:
China--History--Tang dynasty, 618-907.
Xi'an (Shaanxi Sheng, China)--Antiquities.
Xi'an (Shaanxi Sheng, China)--History.