Columbia subject headings:
Peru--Economic conditions--1968---Periodicals.
Peru--Social conditions--1968---Periodicals.
Quality of life--Peru--Periodicals.
Social indicators--Peru--Periodicals.
Harvard subject headings:
Peru--Economic conditions--1968---Periodicals.
Peru--Social conditions--1968---Periodicals.
Quality of life--Peru--Periodicals.
Social indicators--Peru--Periodicals.
Princeton subject headings:
Periodicals.
Peru--Economic conditions--1968---Periodicals.
Peru--Social conditions--1968---Periodicals.
Quality of life--Peru--Periodicals.
Social indicators--Peru--Periodicals.