Columbia subject headings:
Hazardous wastes--Law and legislation--Congresses.
Hazardous wastes--Transportation--Law and legislation--Congresses.
Harvard subject headings:
Hazardous wastes--Government policy.
Hazardous wastes--Law and legislation
Hazardous wastes--Transportation--Environmental aspects.
Hazardous wastes--Transportation--Law and legislation--Congresses.
Princeton subject headings:
Hazardous wastes--Law and legislation--Congresses.