Columbia subject headings:
Argentina--Politics and government--1983-2002.
Concessions--Argentina.
Petroleum industry and trade--Argentina.
Harvard subject headings:
Argentina--Politics and government--1983-2002
Concessions--Argentina.
Petroleum industry and trade--Argentina
Princeton subject headings:
Argentina--Politics and government--1983-2002.
Concessions--Argentina.
Petroleum industry and trade--Argentina.