Columbia subject headings:
War.
World War, 1914-1918--Causes.
World War, 1914-1918--Economic aspects.
Harvard subject headings:
War
World War, 1914-1918--Causes
World War, 1914-1918--Economic aspects
Princeton subject headings:
War.
World War, 1914-1918--Causes.
World War, 1914-1918--Economic aspects.