Columbia subject headings:
Alfonso XIII, King of Spain, 1886-1941.
Spain--History--Alfonso XIII, 1886-1931.
Harvard subject headings:
Alfonso XIII, King of Spain, 1886-1941.
Spain--History--Alfonso XIII, 1886-1931.
Princeton subject headings:
Alfonso XIII, King of Spain, 1886-1941.
Spain--History--Alfonso XIII, 1886-1931.