Resti Arjuni Santi, Dewi Rezki, and Adrinal. “Study Of Soil Physical Properties In Ex-Gold Mining Land, Oil Palm (Elaeis Guineensis Jacq.) Plantation, And Forests On Ultisol”. Jurnal Riset Perkebunan, vol. 3, no. 2, Sept. 2022, pp. 77-92, doi:10.25077/jrp.3.2.77-92.2022.