Columbia subject headings:
Morocco--History--1912-1956.
Morocco--Relations--Spain.
Rif Revolt, 1909.
Spain--Relations--Morocco.
Harvard subject headings:
Abd el-Krim, 1882-1963
Morocco--History--1912-1956.
Morocco--Relations--Spain.
Rif Revolt, 1921-1926
Spain--Relations--Morocco.
Princeton subject headings: