Columbia subject headings:
Harvard subject headings:
Gas industry--Asia, Central.
Gas industry--Caucasus, South.
Natural gas reserves--Asia, Central.
Natural gas reserves--Caucasus, South.
Petroleum industry and trade--Asia, Central.
Petroleum industry and trade--Caucasus, South.
Petroleum reserves--Asia, Central.
Petroleum reserves--Caucasus, South.
Princeton subject headings:
Gas industry--Asia, Central.
Gas industry--Transcaucasia.
Natural gas reserves--Asia, Central.
Natural gas reserves--Transcaucasia.
Petroleum industry and trade--Asia, Central.
Petroleum industry and trade--Transcaucasia.
Petroleum reserves--Asia, Central.
Petroleum reserves--Transcaucasia.