Columbia subject headings:
Income tax--Law and legislation--United States--Congresses.
Income tax--United States--Congresses.
Taxation--Law and legislation--United States.
Harvard subject headings:
Income tax--Law and legislation--United States--Congresses.
Income tax--United States--Congresses.
Taxation--United States
Princeton subject headings:
Income tax--Law and legislation--United States--Congresses.
Income tax--United States--Congresses.