522 Techniques, procedures, apparatus, equipment, materials
522.2 Astronomical instruments
522.29 Fixed-location and space telescopes de
522 Techniken, Verfahren, Geräte, Ausstattung, Materialien
522.2 Astronomische Instrumente    Teleskope
522.29 Teleskope mit festem Standort und Weltraumteleskope
Dewey Decimal Classification
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