Simamora J, Marpaung P, Lubis A. DETERMINATION TYPE OF ALLOPHANE ON ANDISOL IN DOLAT RAKYAT VILLAGE TIGA PANAH DISTRICT, REGENCY OF KARO. Petrop [Internet]. 2015 Dec. 1 [cited 2025 Dec. 19];2(3):228-3. Available from: https://idjpcr.usu.ac.id/jpt/article/view/2916