Columbia subject headings:
Environmental law--Economic aspects--United States.
Environmental policy--Economic aspects--United States.
Pollution--Economic aspects--United States.
Harvard subject headings:
Environmental law--Economic aspects--United States.
Environmental policy--Economic aspects--United States
Pollution--Economic aspects--United States
Princeton subject headings:
Environmental law--Economic aspects--United States.
Environmental policy--United States.
Pollution--Economic aspects--United States.