Columbia subject headings:
Antitrust law--United States.
Competition--United States.
Gasoline industry--Law and legislation--United States.
Gasoline--Prices--Arizona.
Harvard subject headings:
Antitrust law--United States
Competition--United States
Gasoline industry--Law and legislation--United States.
Gasoline--Prices--Arizona.
Princeton subject headings:
Antitrust law--United States.
Competition, Unfair--Arizona.
Gasoline industry--Law and legislation--United States.
Gasoline--Prices--Arizona.