Columbia subject headings:
Harvard subject headings:
Energy industries--Europe--Congresses.
Energy industries--European Union countries--Congresses.
Energy industries--Law and legislation--European Union countries--Congresses.
Energy policy--Europe--Congresses.
Energy policy--European Union countries--Congresses.
Princeton subject headings:
Energy industries--European Union countries--Congresses.
Energy policy--European Union countries--Congresses.