Columbia subject headings:
Energy conservation--Hungary--Periodicals.
Energy policy--Hungary--Periodicals.
Power resources--Hungary--Periodicals.
Harvard subject headings:
Energy conservation--Hungary--Periodicals.
Energy policy--Hungary--Periodicals.
Power resources--Hungary--Periodicals.
Princeton subject headings:
Energy conservation--Hungary--Periodicals.
Energy policy--Hungary--Periodicals.
Periodicals.
Power resources--Hungary--Periodicals.
Power resources--Hungary--Statistics--Periodicals.