Columbia subject headings:
Harvard subject headings:
Labor laws and legislation--Congresses
Labor laws and legislation--Latin America--Congresses.
Social security--Law and legislation--Congresses
Social security--Law and legislation--Latin America--Congresses.
Princeton subject headings:
Labor laws and legislation--Congresses.
Social security--Law and legislation--Congresses.
Social security--Law and legislation--Latin America--Congresses.