http://dewey.info/scheme/edition/e23/ en
629.1325 Flying and related topics
629.13252 Piloting
629.13252071 Flight schools 629.13252078 Flight simulators--aeronautics 629.132521 General topics of piloting 629.132522 Piloting lighter-than-air aircraft 629.132523 Gliders (Aircraft)--piloting 629.1325252 Helicopters--piloting
http://dewey.info/scheme/edition/e22/ de
629.1325 Fliegen und verwandte Themen
629.13252 Steuerung
629.13252071 Flugschulen, . . . 629.13252078 Flugsimulatoren—Luftfahrttechnik 629.132521 Allgemeine Themen der Steuerung 629.132522 Steuerung von Luftfahrzeugen leichter als Luft 629.132523 Gleitflugzeuge—Steuerung 629.1325252 Hubschrauber—Steuerung
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