Columbia subject headings:
Chemicals--Waste disposal--Environmental aspects--United States.
Hazardous substances--Environmental aspects--United States.
Pollution--United States.
Harvard subject headings:
Chemicals--Waste disposal--Environmental aspects--United States.
Hazardous substances--Environmental aspects--United States.
Pollution--United States
Princeton subject headings:
Chemicals--Waste disposal--Environmental aspects--United States.
Hazardous substances--Environmental aspects--United States.
Pollution--Environmental aspects--United States.