Columbia subject headings:
Energy conservation--Luxembourg--Periodicals.
Energy consumption--Luxembourg--Periodicals.
Energy policy--Luxembourg--Periodicals.
Power resources--Luxembourg--Periodicals.
Harvard subject headings:
Energy conservation--Luxembourg--Periodicals.
Energy consumption--Luxembourg--Periodicals.
Energy policy--Luxembourg--Periodicals.
Power resources--Luxembourg--Periodicals.
Princeton subject headings:
Energy conservation--Luxembourg--Periodicals.
Energy consumption--Luxembourg--Periodicals.
Energy policy--Luxembourg--Periodicals.
Periodicals.
Power resources--Luxembourg--Periodicals.