ERWIN HARAHAP, Darmadi; ASTUTI KUSWARDANI, Retna; HS SIREGAR, Tumpal; DARWIS, Muhammad. Nira Production In Terms Of Slope Level In South Tapanuli District. International Journal of Science and Environment (IJSE), [S. l.], v. 4, n. 4, p. 112–116, 2024. DOI: 10.51601/ijse.v4i4.115. Disponível em: https://ijsenet.com/index.php/IJSE/article/view/115. Acesso em: 25 feb. 2026.