Columbia subject headings:
Harvard subject headings:
Catalonia (Spain)--Emigration and immigration--History--20th century.
Immigrants--Spain--History--20th century.
Moroccans--Spain--Catalonia--History--20th century.
Morocco--Emigration and immigration--History--20th century.
Princeton subject headings:
Catalonia (Spain)--Emigration and immigration--History.
Immigrants--Spain--Catalonia--History.
Moroccans--Spain--Catalonia--History.
Morocco--Emigration and immigration--History.