Columbia subject headings:
Harvard subject headings:
Marine pollution--Government policy--North Sea Region.
Marine pollution--Law and legislation--North Sea Region.
Marine resources conservation--Government policy--North Sea Region.
Marine resources conservation--Law and legislation--North Sea Region.
Princeton subject headings:
Marine pollution--Government policy--North Sea Region.
Marine pollution--Law and legislation--North Sea Region.
Marine resources conservation--Government policy--North Sea Region.
Marine resources conservation--Law and legislation--North Sea Region.
Paris Commission.