Columbia subject headings:
Peru--Economic conditions--Congresses.
Peru--Social conditions--Congresses.
Social sciences--Research--Peru--Congresses.
Harvard subject headings:
Peru--Economic conditions--Congresses.
Peru--Social conditions--Congresses.
Social sciences--Research--Peru--Congresses.
Princeton subject headings:
Peru--Rural conditions--Congresses.
Peru--Social conditions--1968---Congresses.
Social sciences--Peru--Congresses.