Columbia subject headings:
Over-the-counter markets--France.
Over-the-counter markets--Great Britain.
Over-the-counter markets--United States.
Harvard subject headings:
Over-the-counter markets--France.
Over-the-counter markets--Great Britain.
Over-the-counter markets--United States.
Princeton subject headings:
Over-the-counter markets--France.
Over-the-counter markets--Great Britain.
Over-the-counter markets--United States.