Columbia subject headings:
Illegal immigration--Ecuador.
Illegal immigration--United States.
Noncitizens--Ecuador.
Noncitizens--United States.
Harvard subject headings:
Illegal immigration--Ecuador.
Illegal immigration--United States.
Noncitizens--Ecuador.
Noncitizens--United States
Princeton subject headings:
Ecuador--Emigration and immigration.
Illegal aliens--United States.
United States--Emigration and immigration.