Columbia subject headings:
Austria--History--1867-1918.
Austria--Kings and rulers--Biography.
Charles I, Emperor of Austria, 1887-1922.
Harvard subject headings:
Austria--History--1867-1918.
Austria--Kings and rulers--Biography.
Charles I, Emperor of Austria, 1887-1922.
Princeton subject headings:
Austria--History--1867-1918.
Austria--Kings and rulers--Biography.
Charles I, Emperor of Austria, 1887-1922.