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