Abdul Kadir Salam, Susilowati, G., Sriyani, N. and Novpriansyah, H. (2025) “The Residual Cu and Zn in Tropical Soils Two Decades after Amendment with Industrial Waste, Calcite and Cassava-Leaf Compost”, Journal of Environmental & Earth Sciences, 7(6), pp. 171–180. doi: 10.30564/jees.v7i6.9211.