Columbia subject headings:
Caucasus, South--Economic conditions.
Investments, Foreign--Caucasus, South--History.
Harvard subject headings:
Caucasus, South--Economic conditions.
Investments, Foreign--Caucasus, South--History.
Princeton subject headings:
Caucasus, South--Economic conditions.
Investments, Foreign--Transcaucasia--History.
Petroleum industry and trade--Transcaucasia--History.