Columbia subject headings:
Brokers--United States.
National Association of Securities Dealers.
Securities--United States.
Harvard subject headings:
Brokers--United States--Periodicals
National Association of Securities Dealers--Periodicals.
Securities--United States--Periodicals
Princeton subject headings:
Investment banking--United States--Periodicals.
Over-the-counter markets--United States--Periodicals.
Periodicals.
Securities--United States--Periodicals.