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Kohnae S, SAFKOLAM R, Sekseng L. THE EFFECTS OF USING LEARNING ACTIVITIES PACKAGE ON ENERGY ON OUR EARTH TO ENHANCE LEARNING ACHIEVEMENT OBSERVATION SKILLS AND CLASSIFICATION SKILLS OF 3rd GRADE STUDENTS UNDER THE COVID-19 SITUATION. Res Comm Soc Dev J [internet]. 2023 Feb. 15 [cited 2025 Apr. 3];17(1):14-25. available from: https://so04.tci-thaijo.org/index.php/NRRU/article/view/262489