Columbia subject headings:
Harvard subject headings:
China--History--Northern Zhou dynasty, 557-581.
Shaanxi Sheng (China)--Antiquities.
Tombs--China--Shaanxi Sheng.
Princeton subject headings:
Excavations (Archaeology)--China--Xi'an Shi.
Tombs--China--Xi'an Shi.
Xi'an Shi (China)--Antiquities.