Columbia subject headings:
Harvard subject headings:
Conservation of natural resources--European Union countries--Periodicals.
Environmental policy--European Union countries--Periodicals.
Environmental protection--European Union countries--Periodicals.
Princeton subject headings:
Conservation of natural resources--European Union countries--Periodicals.
Environmental protection--European Union countries--Periodicals.
Environmental protection--Government policy--European Union countries--Periodicals.
Periodicals.