Shanti Desima Simbolon, Zulkifli Nasution, Abdul Rauf, Delvian 2020. THE RATE OF EROSION AND EROSION HAZARD LEVELS (TBE) IN THE UPPER AREA, FARMER RIVER FLOWS (DAS) IN NORTH SUMATERA. PalArch’s Journal of Archaeology of Egypt / Egyptology. 17, 6 (Nov. 2020), 10626–10645.