World War 76 History 40 Campaigns 30 World war 18 World War, 1939-1945 14 Biography 13 Naval operations 8 Juvenile literature 6 Personal narratives 6 Submarine 6 Causes 5 Campaign 4 Aerial operations 3 Army 3 Foreign relations 3 Japanese occupation 3 Military intelligence 3 Pictorial works 3 Prisoners and prisons 3 Diplomatic history 2 Generals 2 Heads of state 2 Kriegsmarine 2 Military leadership 2 Naval operation 2 Naval operations, German 2 Prisoners of war 2 Secret service 2 Soldiers 2 Underground movements 2