World War, 1939-1945 37 History 32 Biography 10 Campaigns 10 Foreign relations 8 Civilization 5 Atrocities 4 Emperors 4 Japan 4 Naval operations, Japanese 4 Aerial operations 3 History, Military 3 Juvenile literature 3 Military intelligence 3 Politics and government 3 Social conditions 3 World War,1939-1945 3 Admirals 2 Atomic bomb 2 Causes 2 Descriptions and travel 2 Economic conditions 2 Generals 2 Hirohito 2 Naval operations 2 Prisoners and prisons, Japanese 2 World War 2 World war, 1939-1945 2 20th century 1 Aerial operations, Japanese 1