Columbia subject headings:
Harvard subject headings:
Boxing--Law and legislation--United States.
Boxing--Safety regulations--United States.
Boxing--United States--Safety regulations.
Matchmakers (Boxing)--Legal status, laws, etc.--United States.
Princeton subject headings:
Boxing--Law and legislation--United States.
Boxing--Safety regulations--United States.
Matchmakers (Boxing)--Legal status, laws, etc.--United States.