Columbia subject headings:
Harvard subject headings:
Africa, North--Emigration and immigration--Congresses.
Europe--Emigration and immigration--Congresses.
Immigrants--Government policy--Europe--Congresses.
North Africans--Europe--Congresses.
Princeton subject headings:
Africa, North--Emigration and immigration--Congresses.
Europe--Emigration and immigration--Congresses.
Morocco--Emigration and immigration--Congresses.