Columbia subject headings:
Harvard subject headings:
Baseball--Social aspects--United States.
Basketball--Social aspects--United States.
Football--Social aspects--United States.
National characteristics, American
Professional sports--Social aspects--United States.
Princeton subject headings:
Baseball--Social aspects--United States.
Basketball--Social aspects--United States.
Football--Social aspects--United States.
National characteristics, American.
Professional sports--Social aspects--United States.