Butar-Butar, Arwin Juli Rakhmadi, Observatorium Ilmu Falak Universitas Muhammadiyah Sumatera Utara, Indonesia
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Vol 13, No 2 (2016) - Articles
Urgensi Dan Kontribusi Observatorium Di Era Modern
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ISSN: 1410-332X (p); 2540-2979 (e)

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