http://dewey.info/scheme/edition/e23/ en
629.4 Astronautics
629.41 Space flight
629.411 Astromechanics 629.415 Planetary atmospheres 629.416 Space phenomena and environments affecting flight 629.418 Weightlessness
http://dewey.info/scheme/edition/e22/ de
629.4 Astronautik
629.41 Raumfahrt
629.411 Astromechanik 629.415 Planetenatmosphären 629.416 Weltraumphänomene und auf die Raumfahrt einwirkende Umwelten 629.418 Schwerelosigkeit
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