Columbia subject headings:
Caspian Sea Region--Relations--United States.
Energy development--Caspian Sea Region.
Infrastructure (Economics)--Caspian Sea Region.
Petroleum industry and trade--Caspian Sea Region.
United States--Relations--Caspian Sea Region.
Harvard subject headings:
Caspian Sea Region--Relations--United States.
Energy development--Caspian Sea Region.
Infrastructure (Economics)--Caspian Sea Region.
Petroleum industry and trade--Caspian Sea Region
United States--Relations--Caspian Sea Region.
Princeton subject headings:
Caspian Sea Region--Relations--United States.
Energy development--Caspian Sea Region.
Infrastructure (Economics)--Caspian Sea Region.
Petroleum industry and trade--Caspian Sea Region.
United States--Relations--Caspian Sea Region.