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Rizka Hidayah Husin Lubis 2023. Analysis of Learning Difficulties in Renewable and Non-Renewable Energy Sources in Science Subjects for Class III Students at SD It Nur Ihsan Medan. Formosa Journal of Applied Sciences. 2, 3 (Mar. 2023), 413–420. DOI:https://doi.org/10.55927/fjas.v2i3.3405.