Columbia subject headings:
Arab countries--Economic conditions--Congresses.
Petroleum industry and trade--Arab countries--Finance--Congresses.
Harvard subject headings:
Arab countries--Economic conditions--Congresses.
Arab countries--Foreign economic relations--Congresses.
Petroleum industry and trade--Arab countries--Finance--Congresses.
Princeton subject headings:
Arab countries--Economic conditions--Congresses.
Petroleum industry and trade--Arab countries--Finance--Congresses.