Columbia subject headings:
Harvard subject headings:
Social security--Chile
Social security--Costa Rica
Social security--Cuba.
Social security--Latin America--Case studies.
Social security--Mexico
Social security--Peru
Social security--Uruguay
Princeton subject headings:
Social security--Chile.
Social security--Costa Rica.
Social security--Cuba.
Social security--Latin America--Case studies.
Social security--Mexico.
Social security--Peru.
Social security--Uruguay.