Columbia subject headings:
Harvard subject headings:
Foreign workers, Mexican--United States.
Mexicans--United States--Congresses.
Mexico--Emigration and immigration.
Mexico--Relations--United States--Congresses.
United States--Emigration and immigration--Congresses.
United States--Emigration and immigration.
United States--Relations--Mexico--Congresses.
Princeton subject headings:
Mexico--Emigration and immigration--Economic aspects.
United States--Emigration and immigration--Government policy.