Columbia subject headings:
Africa--Emigration and immigration.
Ceuta (Spain)--Emigration and immigration.
Frontier workers--Spain--Ceuta.
Frontier workers--Spain--Melilla.
Melilla (Spain)--Emigration and immigration.
Harvard subject headings:
Ceuta (Spain)--Emigration and immigration--Religious aspects.
Ceuta (Spain)--Emigration and immigration.
Frontier workers--Spain--Ceuta.
Frontier workers--Spain--Melilla.
Melilla (Spain)--Emigration and immigration--Religious aspects.
Melilla (Spain)--Emigration and immigration.
Princeton subject headings:
Africa--Emigration and immigration.
Ceuta (Spain)--Emigration and immigration.
Frontier workers--Spain--Ceuta.
Frontier workers--Spain--Melilla.
Melilla (Spain)--Emigration and immigration.