Columbia subject headings:
Harvard subject headings:
Emigration and immigration--Religious aspects--Christianity--Congresses.
European Union countries--Emigration and immigration--Congresses.
Illegal immigration--European Union countries--Congresses.
Mediterranean Region--Emigration and immigration--Congresses.
Noncitizens--European Union countries--Congresses.
Princeton subject headings:
Emigration and immigration--Religious aspects--Christianity--Congresses.
European Union countries--Emigration and immigration--Congresses.
Illegal aliens--European Union countries--Congresses.
Mediterranean Region--Emigration and immigration--Congresses.