Columbia subject headings:
Arab countries--Economic conditions.
Petroleum industry and trade--Arab countries.
Petroleum industry and trade--Political aspects--Arab countries.
Harvard subject headings:
Arab countries--Economic conditions.
Petroleum industry and trade--Arab countries
Petroleum industry and trade--Political aspects--Arab countries
Princeton subject headings:
Arab countries--Economic conditions.
Petroleum industry and trade--Arab countries.
Petroleum industry and trade--Political aspects--Arab countries.