ANSHARIAH, Anshariah; BINTANG AKBAR , Achmed; ARDIANTO BUDIMAN, Agus. Estimation Of Coal Resources Using the Method Polygon In Bulungan Regency North Kalimantan Province. Journal of Geology and Exploration, [S. l.], v. 1, n. 2, p. 30–35, 2022. DOI: 10.58227/jge.v1i2.10. Disponível em: https://ejournal.insightpublisher.com/index.php/JGE/article/view/10. Acesso em: 23 dec. 2025.