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THE EFFECT OF PROBLEM BASED LEARNING ON STUDENTS’ SCIENCE LEARNING ACHIEVEMENT AT GRADE IV ELEMENTARY SCHOOLS. JPFKIP [Internet]. 2021 Feb. 16 [cited 2025 Dec. 20];10(1):1-7. Available from: https://primary.ejournal.unri.ac.id/index.php/JPFKIP/article/view/665