Columbia subject headings:
Harvard subject headings:
Bathing beaches--European Union countries--Periodicals.
Water quality--European Union countries--Periodicals.
Water--Pollution--European Union countries--Periodicals.
Princeton subject headings:
Bathing beaches--European Union countries--Periodicals.
Periodicals.
Water quality--European Union countries--Periodicals.
Water--Pollution--European Union countries--Periodicals.