Columbia subject headings:
Harvard subject headings:
Public welfare--Law and legislation--History--Chronology.
Public welfare--Law and legislation--Japan--History--Chronology.
Social security--Law and legislation--History--Chronology.
Social security--Law and legislation--Japan--History--Chronology.
Princeton subject headings:
Public welfare--Law and legislation--History--Chronology.
Public welfare--Law and legislation--Japan--History--Chronology.
Social security--Law and legislation--History--Chronology.
Social security--Law and legislation--Japan--History--Chronology.