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