Columbia subject headings:
Charles I, Emperor of Austria, 1887-1922.
World War, 1914-1918--Austria.
World War, 1914-1918--Peace.
Harvard subject headings:
Charles I, Emperor of Austria, 1887-1922.
World War, 1914-1918--Austria
World War, 1914-1918--Peace
Princeton subject headings:
Charles I, Emperor of Austria, 1887-1922.
World War, 1914-1918--Austria.
World War, 1914-1918--Peace.