Columbia subject headings:
Belgium--Emigration and immigration--Government policy.
Foreign workers--Belgium.
Immigrants--Belgium--Social conditions.
Immigrants--Belgium.
Harvard subject headings:
Belgium--Emigration and immigration--Government policy.
Foreign workers--Belgium.
Immigrants--Belgium--Social conditions.
Immigrants--Belgium.
Princeton subject headings:
Belgium--Emigration and immigration--Government policy.
Foreign workers--Belgium.
Immigrants--Belgium--Social conditions.
Immigrants--Belgium.