Columbia subject headings:
Energy policy--United States.
Gas industry--Government policy--United States.
Gasoline industry--Government policy--United States.
Petroleum industry and trade--Government policy--United States.
Harvard subject headings:
Energy policy--United States
Gas industry--Government policy--United States
Gasoline industry--Government policy--United States.
Petroleum industry and trade--Government policy--United States
Princeton subject headings:
Energy policy--United States.
Gas industry--Government policy--United States.
Gasoline industry--Government policy--United States.
Petroleum industry and trade--Government policy--United States.