Columbia subject headings:
Constantine I, King of the Hellenes, 1868-1923.
World War, 1914-1918--Greece.
Harvard subject headings:
Constantine I, King of the Hellenes, 1868-1923.
World War, 1914-1918--Greece
Princeton subject headings:
Constantine I, King of the Hellenes, 1868-1923.
World War, 1914-1918--Greece.