Columbia subject headings:
Europe--Politics and government--1918-1945.
World War, 1914-1918--Diplomatic history.
Harvard subject headings:
Europe--Politics and government--1914-
Europe--Politics and government--1918-1945
World War, 1914-1918--Diplomatic history
Princeton subject headings:
Europe--Politics and government--1918-1945.
World War, 1914-1918--Diplomatic history.