Columbia subject headings:
Free trade--Mexico.
Industrial relations--Mexico.
Labor unions--Mexico.
Harvard subject headings:
Free trade--Mexico--Congresses.
Industrial relations--Mexico--Congresses.
Labor policy--Mexico--Congresses.
North American Free Trade Agreement--Congresses.
Princeton subject headings:
Canada. Treaties, etc. 1992 Oct. 7--Congresses.
Free trade--Mexico--Congresses.
Industrial relations--Mexico--Congresses.
Labor policy--Mexico--Congresses.