World War, 1939-1945 292 History 75 Campaigns 62 World War, 1914-1918 59 English fiction 29 Prisoners and prisons, Japanese 17 Underground movements 16 World war, 1939-1945 16 World War, 15 Naval operations 14 Social aspects 14 World War 14 Fiction 13 Aerial operations 12 Secret service 12 Prisoners of war 11 Submarine 11 Biography 10 Cryptography 10 Personal narratives, British 10 Veterans 10 Electronic intelligence 9 Great Britain 9 Enigma cipher system 8 Fathers and sons 8 Jews 8 Naval operations, American 8 Personal narratives, Japanese 8 Soldiers 8 Airplanes, Military 7