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