OBSERVATORIES (ASTRONOMY)
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BTASTRONOMICAL INSTRUMENTS AND TECHNIQUES
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UDC520.1
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Descriptor GEROBSERVATORIEN (ASTRONOMIE)
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Descriptor ENGOBSERVATORIES (ASTRONOMY)
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Descriptor FREOBSERVATOIRES (ASTRONOMIE)
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Variant GERSTERNWARTEN (ASTRONOMIE)
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Variant ENGASTRONOMICAL OBSERVATORIES
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NTVIRTUAL OBSERVATORIES (ASTRONOMY)