Columbia subject headings:
Harvard subject headings:
Cartels--History.
Organization of Petroleum Exporting Countries--History.
Petroleum industry and trade--Saudi Arabia--History.
Petroleum products--Prices--History.
Petroleum products--Prices--Saudi Arabia--History.
Princeton subject headings:
Organizaion of Petroleum Exporting Countries--History.
Petroleum industry and trade--Saudi Arabia--History.
Petroleum products--Prices--History.