Columbia subject headings:
Arab countries--Economic integration.
Petroleum industry and trade--Arab countries--Statistics.
Petroleum industry and trade--Government policy--Arab countries.
Harvard subject headings:
Arab countries--Economic integration.
Petroleum industry and trade--Arab countries--Statistics.
Petroleum industry and trade--Government policy--Arab countries.
Princeton subject headings:
Arab countries--Economic integration.
Petroleum industry and trade--Arab countries--Statistics.
Petroleum industry and trade--Government policy--Arab countries.