Columbia subject headings:
Double taxation--Canada.
Double taxation--Germany.
Double taxation--United States.
Income tax--Canada.
Income tax--Germany.
Income tax.
Taxation--Doubles--Canada.
Taxation--Doubles--Germany.
Taxation--Doubles--United States.
Harvard subject headings:
Double taxation--Canada.
Double taxation--Germany.
Double taxation--United States
Income tax--Canada
Income tax--Germany.
Income tax.
Princeton subject headings: