Columbia subject headings:
Abd el-Krim, 1882-1963.
Chemical warfare--Morocco--Spanish Zone--History--20th century.
Germany--History, Military--20th century.
Morocco (Spanish zone)--History.
Rif Revolt, 1921-1926--Chemical warfare.
Spain--History, Military--20th century.
Harvard subject headings:
Abd el-Krim, 1882-1963
Chemical warfare--Morocco (Spanish zone)--History--20th century.
Germany--History, Military--20th century.
Morocco (Spanish zone)--History.
Rif Revolt, 1921-1926--Chemical warfare.
Spain--History, Military--20th century.
Princeton subject headings:
Abd el-Krim, 1882-1963.
Chemical warfare--Morocco (Spanish zone)--History--20th century.
Germany--History, Military--20th century.
Morocco (Spanish zone)--History.
Rif Revolt, 1921-1926--Chemical warfare.
Spain--History, Military--20th century.