Columbia subject headings:
Caspian Sea Region--Politics and government.
National security--Caspian Sea Region.
Natural resources--Caspian Sea Region.
Security, International.
Harvard subject headings:
Caspian Sea Region--Politics and government.
National security--Caspian Sea Region.
Natural resources--Caspian Sea Region.
Security, International.
Princeton subject headings:
Caspian Sea Region--Politics and government.
National security--Caspian Sea Region.
Natural resources--Caspian Sea Region.
Security, International.