Columbia subject headings:
Energy policy--United States.
Environmental impact charges--United States.
Environmental policy--United States.
Petroleum--Taxation--United States.
Harvard subject headings:
Energy policy--United States
Environmental policy--United States
Petroleum--Taxation--United States
Princeton subject headings:
Energy policy--United States.
Environmental impact charges--United States.
Environmental policy--United States.
Petroleum--Taxation--United States.