Columbia subject headings:
Chronologies.
Japan--History--Heisei period, 1989-2019--Chronology.
Japan--History--Shōwa period, 1926-1989--Chronology.
Harvard subject headings:
Princeton subject headings:
Japan--History--Heisei period, 1989---Chronology.
Japan--History--Shōwa period, 1926-1989--Chronology.