Columbia subject headings:
Harvard subject headings:
Drugs--Generic substitution--Law and legislation--United States.
Drugs--Law and legislation--United States.
General Agreement on Tariffs and Trade
Intellectual property (International law)
Patents (International law)
Princeton subject headings:
Drugs--Law and legislation--United States.
General Agreement on Tariffs and Trade
Generic drugs--Law and legislation--United States.
Intellectual property (International law)
Patents (International law)