Columbia subject headings:
Gas industry--International Energy Agency countries.
Gas industry--OECD countries.
Natural gas reserves--International Energy Agency countries.
Natural gas reserves--OECD countries.
Natural gas--Forecasting.
Natural gas--Transportation.
Harvard subject headings:
Gas industry
Gas industry--Forecasting.
Natural gas reserves.
Natural gas--Forecasting.
Natural gas--Transportation
Princeton subject headings:
Gas industry.
Natural gas reserves.
Natural gas--Forecasting.
Natural gas--Transportation.