Rahmi A, Helendra H. RELATIONSHIP BETWEEN THE CLAY COMPOSITION AND THE SOIL SOURCE IN WEST SUMATERA. jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2018 Nov. 27 [cited 2024 Nov. 22];5(1). Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/152