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PENERAPAN MODEL PROBLEM BASED LEARNING UNTUK MENINGKATKAN HASIL BELAJAR IPAS SISWA SEKOLAH DASAR. IPSSJ [Internet]. 2026 Oct. 13 [cited 2026 Oct. 21];3(10 Oktober):632-9. Available from: https://ipssj.com/index.php/ojs/article/view/2134