Juvenile literature 15 Automobiles, Racing 2 Tanks (Military science) 2 Airplanes, Military 1 Astronautics 1 Attack planes 1 Boats and boating 1 Communication 1 Effect of technological innovations on 1 Exploration 1 Fighter planes 1 Military art and science 1 Miscellanea 1 Motorcycles 1 Off-road vehicles 1 Onter space 1 Space vehicles 1 Sports cars 1 Superbikes 1 Technology 1 Transportation 1 Vehicles 1 Vehicles, Military 1 Weapons systems 1