Columbia subject headings:
Illegal immigration--United States--Costs.
Noncitizens--Services for--United States--Costs.
United States--Emigration and immigration--Government policy.
Harvard subject headings:
Illegal immigration--United States--Costs.
Noncitizens--Services for--United States--Costs.
United States--Emigration and immigration--Government policy
Princeton subject headings:
Illegal aliens--Services for--Economic aspects--United States.
United States--Emigration and immigration--Government policy.