ANALISIS PERUBAHAN LINGKUNGAN PANAS BUMI TINGGI RAJA KABUPATEN SIMALUNGUN. einstein e-j. [Internet]. 2020 Feb. 27 [cited 2026 Mar. 23];8(1):61-6. Available from: https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/14098