Columbia subject headings:
Gas industry--Caspian Sea Region.
International law.
Natural gas--Law and legislation.
Petroleum industry and trade--Caspian Sea Region.
Petroleum law and legislation.
Harvard subject headings:
Caspian Sea Region--Politics and government.
Caspian sea--International status.
Gas industry--Caspian Sea Region.
Geopolitics--Caspian Sea Region.
Hazardous geographic environments--Caspian Sea Region.
Natural gas in submerged lands--Environmental aspects--Caspian Sea Region.
Natural resources--Law and legislation--Caspian Sea Region.
Petroleum in submerged lands--Environmental aspects--Caspian Sea Region.
Petroleum industry and trade--Caspian Sea Region
Princeton subject headings: