Kurnia Rapa, M.F. and Pambudi , N.F. 2026. Integrating Lean Six Sigma and Soil Quality Preservation in Topsoil Removal Operations: A Case Study of Indonesian Coal Mining. Devotion : Journal of Research and Community Service. 7, 8 (Aug. 2026), 1014–1031. DOI:https://doi.org/10.59188/devotion.v7i8.25755.