World War, 1939-1945 Fiction 283 History 219 Campaigns 121 Economic aspects 86 Foreign relations 79 Biography 72 Politics and government 72 Underground movements 51 Diplomatic history 42 Personal narratives, British 38 Jews 29 Peace 29 Causes 27 Personal narratives 27 Personal narratives, American 26 World War, 1914-1918 26 Sources 25 Prisoners and prisons, German 24 Secret service 23 Finance 21 Reconstruction (1939-1951) 20 Aerial operations, British 18 Atrocities 17 Description and travel 17 Food supply 17 Poetry 17 Prisoners of war 16 Economic conditions 15 Naval operations 15