Noraini, Alifah, Martinus Edwin Tjahjadi, and Jasmani Jasmani. “Classification of Slope for Coffee Plantation in Ngajum District, Indonesia”. Buletin Poltanesa 25, no. 1 (June 19, 2024): 110–115. Accessed September 19, 2024. https://e-journal.politanisamarinda.ac.id/index.php/tanesa/article/view/2227.