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Putrawiyanta, I. P.; Nadeak, R. .; Nababan, I. . PENGAMATAN PRODUKTIVITAS ALAT GALI MUAT DAN ANGKUT PADA KEGIATAN OVERBURDEN REMOVAL DAN COAL GETTING: OBSERVATION OF THE PRODUCTIVITY OF LOADING AND TRANSPORTING EQUIPMENT IN OVERBURDEN REMOVAL AND COAL GETTING ACTIVITIES. JTP 2024, 24, 80-85.