Columbia subject headings:
Chemicals--Law and legislation--Europe.
Chemicals--Law and legislation--United States.
Hazardous substances--Law and legislation--Europe.
Hazardous substances--Law and legislation--United States.
Harvard subject headings:
Chemicals--Law and legislation--Europe.
Chemicals--Law and legislation--United States
Hazardous substances--Law and legislation--Europe.
Hazardous substances--Law and legislation--United States.
Princeton subject headings:
Chemicals--Law and legislation--Europe.
Chemicals--Law and legislation--United States.
Hazardous substances--Law and legislation--Europe.
Hazardous substances--Law and legislation--United States.