Columbia subject headings:
Law and art--Congresses.
Tax deductions--Canada--Congresses.
Tax deductions--Great Britain--Congresses.
Tax deductions--United States--Congresses.
Harvard subject headings:
Law and art--Congresses.
Tax deductions--Canada--Congresses.
Tax deductions--Great Britain--Congresses.
Tax deductions--United States--Congresses.
Princeton subject headings: