Somjai, N. (2022). The Effect of Instructional Management with The use of Geographic Process in The Topic of Conservation of Nan Forest on Learning Achievement and Systematic Thinking Ability of Prathom Suksa V Student in Nan Province: The Effect of Instructional Management with The use of Geographic Process in The Topic of Conservation of Nan Forest on Learning Achievement and Systematic Thinking Ability of Prathom Suksa V Student in Nan Province. OBEC Basic Education Research Journal, 2(2). retrieved from https://so06.tci-thaijo.org/index.php/obecresearch/article/view/255237