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An auxiliary power unit (APU) is a device on a vehicle that provides energy for functions other than propulsion. They are commonly found on large aircraft...

This is a list of countries (or regions) by total road network size, both paved and unpaved. Also included is additional data on the length of each country's...

Due to the Messerschmitt Bf 109's versatility and time in service with the German and foreign air forces, numerous variants were produced in Germany to...