Columbia subject headings:
Petroleum industry and trade--Forecasting.
Petroleum industry and trade.
Petroleum reserves--Forecasting.
Petroleum reserves.
Harvard subject headings:
Petroleum industry and trade--Forecasting
Petroleum industry and trade.
Petroleum reserves--Forecasting.
Petroleum reserves.
Power resources
Power resources--Forecasting
Princeton subject headings:
Petroleum industry and trade--Forecasting.
Petroleum industry and trade.
Petroleum reserves--Forecasting.
Petroleum reserves.