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Mineral and Geochemistry Study of Lower Kutai Basin Coal East Kalimantan
(IOP Publishing; IOP Conf. Series: Earth and Environmental Science 375 (2019) 012009, 2019-12-03)
Karakteristik Batubara Formasi Pulaubalang dan Balikpapan Cekungan Kutai Bawah, Kalimantan Timur
(Jurnal Geosapta, Universitas Lambungmangkurat, 2019-01-31)