Columbia subject headings:
Gasoline--Prices--United States.
Organization of Petroleum Exporting Countries.
Petroleum industry and trade.
Petroleum products--Prices--United States.
Harvard subject headings:
Gasoline--Prices--United States
Organization of Petroleum Exporting Countries.
Petroleum industry and trade.
Petroleum products--Prices--United States
Princeton subject headings:
Gasoline--Prices--United States.
Organization of Petroleum Exporting Countries.
Petroleum industry and trade.
Petroleum products--Prices--United States.