Columbia subject headings:
Morocco--Foreign relations--Spain.
Spain--Foreign relations--Morocco.
Spain--Politics and government--20th century.
Harvard subject headings:
Morocco--Foreign relations--Spain.
Spain--Foreign relations--Morocco.
Spain--History--Alfonso XIII, 1886-1931.
Spain--Politics and government--1886-1931.
Spain--Politics and government--20th century.
Princeton subject headings:
Morocco--Foreign relations--Spain.
Spain--Foreign relations--Morocco.
Spain--Politics and government--20th century.