Columbia subject headings:
Compañía Española de Minas del Rif--History.
Iron mines and mining--Morocco--History--20th century.
Mines and mineral resources--Morocco--History--20th century.
Rif Mountains Region (Morocco)--History.
Harvard subject headings:
Compañía Española de Minas del Rif S.A.--History.
Iron mines and mining--Morocco--Rif Mountains.
Morocco (Spanish zone)--History--20th century.
Morocco (Spanish zone)--Relations--Spain.
Spain--Relations--Morocco (Spanish zone)
Princeton subject headings:
Compañía Española de Minas del Rif.
Iron mines and mining--Morocco--Rif Mountains.
Mines and mineral resources--Morocco--History--20th century.
Morocco (Spanish zone)--History--20th century.
Morocco (Spanish zone)--Relations--Spain.
Spain--Colonies--Africa--20th century--History.
Spain--Relations--Morocco (Spanish zone).