Columbia subject headings:
Argentina--Foreign economic relations--United States.
Petroleum industry and trade--Argentina--History.
Petroleum industry and trade--Government ownership--Argentina--History.
United States--Foreign economic relations--Argentina.
Harvard subject headings:
Argentina--Foreign economic relations--United States.
Petroleum industry and trade--Argentina--History.
Petroleum industry and trade--Government ownership--Argentina--History.
United States--Foreign economic relations--Argentina.
Princeton subject headings:
Argentina--Foreign economic relations--United States.
Petroleum industry and trade--Argentina--History.
Petroleum industry and trade--Government ownership--Argentina--History.
United States--Foreign economic relations--Argentina.