Columbia subject headings:
Income tax--United States--Statistics--Periodicals.
Partnership--Taxation--United States--Statistics--Periodicals.
Sole proprietorship--Taxation--United States--Statistics--Periodicals.
Harvard subject headings:
Princeton subject headings:
Income tax--United States--Statistics--Periodicals.
Partnership--Taxation--United States--Statistics--Periodicals.
Periodicals.
Sole proprietorship--Taxation--United States--Statistics--Periodicals.
Statistics.