Columbia subject headings:
Double taxation--North America--Treaties.
Fiscal policy--North America.
Free trade--North America.
North America--Economic integration.
Taxation--Law and legislation--North America.
Harvard subject headings:
Double taxation--North America--Treaties.
Fiscal policy--North America.
Foreign trade regulation--North America.
Free trade--North America
North America--Economic integration
Taxation--Law and legislation--North America.
Princeton subject headings:
Foreign trade regulation--North America.
North American Free Trade Agreement
Taxation--Law and legislation--North America.