Columbia subject headings:
Caspian Sea Region--Economic conditions.
Caspian Sea Region--History.
Caspian Sea Region--Politics and government.
Caspian Sea Region--Strategic aspects.
Harvard subject headings:
Caspian Sea Region--Economic conditions.
Caspian Sea Region--History.
Caspian Sea Region--Politics and government.
Caspian Sea Region--Strategic aspects.
Princeton subject headings: