Columbia subject headings:
Emigration and immigration law--United States--Congresses.
Foreign workers--United States--Congresses.
Illegal immigration--United States--Congresses.
Mexico--Foreign relations--United States--Congresses.
Noncitizens--United States--Congresses.
Refugees--Legal status, laws, etc.--United States--Congresses.
United States--Foreign relations--Mexico--Congresses.
Harvard subject headings:
Agricultural laborers, Foreign--United States--Congresses.
Conference papers and proceedings
Emigration and immigration law--United States--Congresses
Foreign workers--Legal status, laws, etc.--United States--Congresses.
Mexico--Foreign relations--United States--Congresses.
Migrant labor--Medical care--United States--Congresses.
Refugees--Legal status, laws, etc.--United States--Congresses.
United States--Foreign relations--Mexico--Congresses.
Princeton subject headings: