Columbia subject headings:
Environmental policy--Europe.
Factory and trade waste--Law and legislation--Europe.
Industrial laws and legislation--Europe.
Pollution--Law and legislation--Europe.
Harvard subject headings:
Environmental policy--Europe
Factory and trade waste--Law and legislation--Europe.
Industrial laws and legislation--Europe.
Pollution--Law and legislation--Europe.
Princeton subject headings:
Environmental policy--Europe.
Factory and trade waste--Law and legislation--Europe.
Industrial laws and legislation--Europe.
Pollution--Law and legislation--Europe.