Columbia subject headings:
Europe--Politics and government--1871-1918.
Nineteen fourteen, A.D.
World War, 1914-1918--Causes.
World War, 1914-1918.
Harvard subject headings:
Europe--Politics and government--1871-1918.
Nineteen fourteen, A.D.
World War, 1914-1918
World War, 1914-1918--Causes
Princeton subject headings:
World War, 1914-1918--Causes.
World War, 1914-1918.