History 25 World War, 1939-1945 12 Airplanes, Military 9 Fighter planes 6 Biography 5 Aeronautics, Military 4 Aeroplanes, Military 3 Juvenile literature 3 Pictorial works 3 Aerial operations, American 2 Aerial operations, British 2 Air warfare 2 Allied occupation 2 Armed Forces 2 Armoured vehicles, Military 2 Astronomy 2 Atomic weapons 2 Botany 2 Butterflies 2 Campaigns 2 Curiosities and wonders 2 Dictionaries 2 Equipment and supplies 2 Golf 2 Interior decoration 2 Naval operations 2 Pearl Harbor (Hawaii), Attack on, 1941 2 Popular works 2 Soccer 2 Strategic forces 2