World War, 1939-1945 History 58 Campaigns 44 Biography 31 Aerial operations 23 Personal narratives, American 20 Regimental histories 18 Foreign relations 15 United States 12 Soldiers 10 Naval operations, American 9 Aerial operations, American 8 Armed Forces 8 Secret service 8 Diplomatic history 7 Airplanes, Military 6 Army 6 Pacific Area 6 Equipment and supplies 5 Marines 5 Prisoners of war 5 Atomic bomb 4 Causes 4 Generals 4 Military intelligence 4 Naval operations 4 Western Front 4 World war, 1939-1945 4 Diaries 3 History, Military 3