Columbia subject headings:
Foreign workers, Mexican--United States.
Free trade--Mexico.
Free trade--United States.
Mexicans--Employment--United States.
Mexico--Emigration and immigration--Economic aspects.
North American Free Trade Agreement
United States--Emigration and immigration--Economic aspects.
Harvard subject headings:
Foreign workers, Mexican--United States.
Free trade--Mexico
Free trade--United States
Mexicans--Employment--United States.
Mexico--Emigration and immigration--Economic aspects.
North American Free Trade Agreement
United States--Emigration and immigration--Economic aspects.
Princeton subject headings:
Foreign workers, Mexican--United States.
Free trade--Mexico.
Free trade--United States.
Mexicans--Employment--United States.
Mexico--Emigration and immigration--Economic aspects.
North American Free Trade Agreement
United States--Emigration and immigration--Economic aspects.