Columbia subject headings:
Middle class--Peru.
Mineral industries--Peru.
Peru--Economic conditions--1968-
Peru--Politics and government--1968-1980.
Peru--Social conditions--1968-
Harvard subject headings:
Middle class--Peru.
Mineral industries--Peru
Peru--Economic conditions--1968-
Peru--Politics and government--1968-1980
Peru--Social conditions--1968-
Princeton subject headings:
Middle class--Peru.
Mineral industries--Peru.
Peru--Economic conditions--1968-
Peru--Politics and government--1968-.
Peru--Social conditions--1968-