http://dewey.info/scheme/edition/e23/ en
940.3 World War I, 1914-1918
940.31 Social, political, economic history
940.311 Causes of war--World War I 940.312 Peace--World War I 940.3141 Treaty of Versailles, 1919--European history 940.31422 Reparations--World War I 940.31425 New nations--establishment--World War I 940.31426 Mandates--establishment--World War I 940.3144 Reconstruction (Aftermath of war)--World War I 940.3161 Children--World War I 940.3162 Pacifists--World War I 940.3163 Enemy sympathizers--World War I 940.317 Internment camps--World War I
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