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 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
Dewey Decimal Classification
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