Columbia subject headings:
International Socialist Congress--History.
Labour Party (Great Britain)--History.
War and socialism--Europe--History.
War and socialism--Great Britain--History.
World War, 1914-1918--Causes.
Harvard subject headings:
Labour Party (Great Britain)--History.
Socialist International (1889-1922)--History.
War and socialism--Europe--History.
War and socialism--Great Britain--History.
World War, 1914-1918--Causes
Princeton subject headings:
International Socialist Congress--History.
Labour Party (Great Britain)--History.
War and socialism--Europe--History.
War and socialism--Great Britain--History.
World War, 1914-1918--Causes.