Columbia subject headings:
Harvard subject headings:
Greece--Foreign relations--1863-1917.
Greece--Foreign relations.
Greece--History--Constantine I, 1913-1917.
Greece--Politics and government--1913-1917.
World War, 1914-1918--Greece
Princeton subject headings:
Greece--Foreign relations.
Greece--History--Constantine I, 1913-1917.
World War, 1914-1918--Greece.