Columbia subject headings:
Harvard subject headings:
Energy consumption--European Union countries--Statistics--Periodicals.
Environmental indicators--European Union countries--Periodicals.
Environmental protection--European Union countries--Statistics--Periodicals.
Power resources--European Union countries--Statistics--Periodicals.
Transportation--European Union countries--Statistics--Periodicals.
Princeton subject headings:
Energy consumption--European Union countries--Statistics--Periodicals.
Environmental indicators--European Union countries--Periodicals.
Environmental protection--European Union countries--Statistics--Periodicals.
Periodicals.
Power resources--European Union countries--Statistics--Periodicals.
Statistics.