Columbia subject headings:
Harvard subject headings:
Double taxation--France--Treaties.
Double taxation--United States--Treaties.
Income tax--Law and legislation--France.
Income tax--Law and legislation--United States.
Princeton subject headings:
Double taxation--France--Treaties.
Double taxation--Portugal--Treaties.
Double taxation--United States--Treaties.
Income tax--Law and legislation--France.
Income tax--Law and legislation--Portugal.
Income tax--Law and legislation--United States.
Treaties.