Columbia subject headings:
Border patrols--United States.
Illegal immigration--United States.
Noncitizens--United States.
United States--Emigration and immigration.
United States. Immigration and Naturalization Service.
Harvard subject headings:
Border patrols--Southwest, New.
Illegal immigration--Southwest, New.
Legislative hearings
Noncitizens--Southwest, New.
United States--Emigration and immigration
Princeton subject headings:
Border patrols--United States.
Illegal aliens--United States.
United States--Emigration and immigration.
United States. Immigration and Naturalization Service