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“APPLICATION OF THE PJBL-STEM LEARNING MODEL ON SMOKELESS WASTE COMBUSTION DEVICE ON TEMPERATURE, HEAT, AND EXPANSION TO IMPROVE THE COGNITIVE LEARNING OUTCOMES OF STUDENTS OF CLASS VII SMPN 1 TAPUNG HULU”, SPEKTRA, vol. 11, no. 1, pp. 186–199, Jul. 2025, doi: 10.32699/spektra.v11i1.8900.