Columbia subject headings:
Harvard subject headings:
Photography--China--Xi'an Shi.
Xi'an Shi (China)--History.
Xi'an Shi (China)--Pictorial works.
Princeton subject headings:
Photography--China--Xi'an (Shaanxi Sheng).
Xi'an (Shaanxi Sheng, China)--History.
Xi'an (Shaanxi Sheng, China)--Pictorial works.