2020. IDENTIFIKASI LAPISAN PENYEBAB LONGSOR MENGGUNAKAN GROUND PENETRATING RADAR AREA MONUMEN PESAWAT SANGATTA PT. KALTIM PRIMA COAL. GEOSAINS KUTAI BASIN. 3, 2 (Aug. 2020). DOI:https://doi.org/10.30872/geofisunmul.v3i2.692.