Columbia subject headings:
Price discrimination--United States--States.
Price maintenance--United States--States.
Harvard subject headings:
Commercial law--United States
Interstate commerce
Price discrimination--United States
Price maintenance--United States
Restraint of trade--United States.
Princeton subject headings:
Commercial law--United States.
Interstate commerce.
Price discrimination--United States.
Price maintenance--United States.
Restraint of trade--United States.