Columbia subject headings:
Antitrust law--United States.
Cartels--United States.
Petroleum industry and trade--United States.
Harvard subject headings:
Antitrust law--United States
Petroleum industry and trade--United States
Trusts, Industrial--United States.
Princeton subject headings:
Antitrust law--United States.
Cartels--United States.
Petroleum industry and trade--United States.