G.C. Anyanwu, and O. EVANGELINA. O. “MINERALOGICAL AND CHEMICAL COMPOSITION EVALUATION OF LIGNITE COAL FROM IHIOMA ORLU, IMO STATE OF NIGERIA.”. IJRDO-Journal of Applied Science, Vol. 8, no. 4, Apr. 2022, pp. 7-13, doi:10.53555/as.v8i4.5008.