OSN Astronomy 2010 Soal

Astronomy 2010, Indonesian language, olympiad, OSN, problems, format pdf, contents 5 pages, 25 problems.

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http://soal-olim-astro.blogspot.com

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http://soal-olim-astro.blogspot.com/2011/03/soal-soal-osn-osp-2010.html