Columbia subject headings:
Arab countries--Foreign economic relations--United States.
Petroleum industry and trade--Arab countries.
Petroleum industry and trade--United States.
United States--Foreign economic relations--Arab countries.
Harvard subject headings:
Arab countries--Foreign economic relations--United States.
Petroleum industry and trade--Arab countries
Petroleum industry and trade--United States
United States--Foreign economic relations--Arab countries.
Princeton subject headings:
Arab countries--Foreign eonomic relations--United States.
Petroleum industry and trade--Arab countries.
Petroleum industry and trade--United States.
United States--Foreign economic relations--Arab countries.