Items where Subject is "500 Natural Science and Mathematics/Ilmu-ilmu Alam dan Matematika > 520 Comprehensive Works of Astronomy/Karya Komprehensif tentang Astronomi > 520.1-520.9 Standard Subdivisions of Comprehensive Works of Astronomy/Subdivisi Standar Dari Karya Komprehensif tentang Astronomi > 520.6 Organization and Management of Astronomy/Organisasi dan Manajemen di Bidang Astronomi"

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