Columbia subject headings:
Alfonso XIII, King of Spain, 1886-1941--Assassination attempts.
Morral, Mateo.
Political crimes and offenses--Spain.
Spain--History--Alfonso XIII, 1886-1931.
Harvard subject headings:
Alfonso XIII, King of Spain, 1886-1941--Assassination attempts.
Anarchists--Spain--Biography
Assassination--Spain--Madrid--History--20th century.
Assassins--Spain--Biography.
Morral Roca, Mateo, 1880-1906.
Princeton subject headings: