Columbia subject headings:
Petroleum industry and trade--Azerbaijan--History.
Petroleum industry and trade--Political aspects--Azerbaijan.
Harvard subject headings:
Petroleum industry and trade--Azerbaijan--Baku--History.
Petroleum industry and trade--Azerbaijan--History.
Petroleum industry and trade--Political aspects--Azerbaijan--Baku.
Petroleum industry and trade--Political aspects--Azerbaijan.
Princeton subject headings:
Petroleum industry and trade--Azerbaijan--Baku--History.
Petroleum industry and trade--Azerbaijan--History.
Petroleum industry and trade--Political aspects--Azerbaijan--Baku.
Petroleum industry and trade--Political aspects--Azerbaijan.