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Ihda, Kurotul Aini and Dhi, Bramasta and Badarudin, Badarudin (2019) The Development of Study Achievement 4th Grade Students Using Problem Based Learning Model on 9th Theme Kayanya Negeriku in SD N 2 Sokaraja Kulon. PROCEEDING 1st International Seminar STEMEIF (Science, Technology, Engineering and Mathematics Learning International Forum) “Strengtheing the STEM Education and Digital Skills”.