Columbia subject headings:
Harvard subject headings:
China--History--Chronology.
Japan--History--Chronology.
Korea--History--Chronology.
Princeton subject headings:
China--History--Chronology.
China--Kings and rulers--Chronology.
East Asia--History--Chronology.
Emperors--Japan--Chronology.
Japan--History--Chronology.
Korea--History--Chronology.
Korea--Kings and rulers--Chronology.