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2022. Identification of Characteristics and Distribution of Subsurface Coal Using the 2D Geoelectric Method in Tanjung Palas Timur District, North Kalimantan. Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics. 5, 1 (Oct. 2022), 33–45. DOI:https://doi.org/10.15408/fiziya.v5i2.23106.