Potensi Tegakan Pada Hutan Lindung Bekas Pertambangan Tradisional Kabupaten Mandailing Natal (The Potential of Stands in the Former Traditional Mining Preserve Forest Mandailing Natal) - Utomo, Budi; Program Studi Kehutanan,Fakultas Pertanian, Universitas Sumatera Utara, Jl. Tri Dharma Ujung No. 1 Kampus USU Medan 20155 (FORESTA, 2013)