Columbia subject headings:
Maps.
Power resources--Europe, Northern--Maps.
Harvard subject headings:
Electric power-plants--Europe, Northern--Maps.
Electric power-plants--Europe, Western--Maps.
Energy policy--Europe--Maps.
Fossil fuels--Europe, Northern--Maps.
Fossil fuels--Europe, Western--Maps.
Fossil fuels--North Sea--Maps.
Gas industry--Europe, Northern--Maps.
Gas industry--Europe, Western--Maps.
Gas industry--North Sea--Maps.
Petroleum industry and trade--Europe, Northern--Maps.
Petroleum industry and trade--Europe, Western--Maps.
Petroleum industry and trade--North Sea--Maps.
Power resources--Europe, Northern--Maps.
Power resources--Europe, Western--Maps.
Power resources--North Sea--Maps.
Princeton subject headings: