Mujiyo, M, S Sumarno, S Sudadi, and Retno Wisnu Murti. “Assessment of Soil Degradation in Pitu District, Ngawi Regency”. Journal of Degraded and Mining Lands Management 7, no. 2 (January 1, 2020): 2049–2057. Accessed June 24, 2024. https://jdmlm.ub.ac.id/index.php/jdmlm/article/view/601.