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