Columbia subject headings:
Professions--Law and legislation--United States--Congresses.
Professions--Licenses--United States--Congresses.
Harvard subject headings:
Professions--Law and legislation--United States--Congresses.
Professions--Licenses--United States--Congresses.
Princeton subject headings:
Professions--Law and legislation--United States--Congresses.
Professions--Licenses--United States--Congresses.