Columbia subject headings:
Harvard subject headings:
China--History--Northern and Southern dynasties, 386-589.
Li, Yanshou, active 7th century. Bei shi.
Li, Yanshou, active 7th century. Nan shi.
Princeton subject headings:
China--History--220-589.
Li, Yanshou, 7th cent. Bei shi.
Li, Yanshou, 7th cent. Nan shi.