Columbia subject headings:
Canada--Statistical services--Congresses.
Income tax--Canada--Statistical methods--Congresses.
Income tax--United States--Statistical methods--Congresses.
Income--United States--Statistical methods--Congresses.
United States--Statistical services--Congresses.
Harvard subject headings:
Canada--Statistical services--Congresses.
Income tax--Canada--Statistical methods--Congresses.
Income tax--United States--Statistical methods--Congresses.
Income--United States--Statistical methods--Congresses.
United States--Statistical services--Congresses.
Princeton subject headings:
Canada--Statistical services--Congresses.
Income tax--Canada--Statistical methods--Congresses.
Income tax--United States--Statistical methods--Congresses.
Income--United States--Statistical methods--Congresses.
United States--Statistical services--Congresses.