Columbia subject headings:
Age groups--Japan--History--To 1500.
Japan--History--To 1185.
Harvard subject headings:
Age groups--Japan--History--To 1500.
Japan--History--To 1185.
Japan--Social conditions--To 1500.
Princeton subject headings:
Age groups--Japan--History--To 1500.
Japan--History--To 1185.
Japan--Social conditions--To 1500.
Japan--Social conditions--To 1600.