Akanwa O, A., F. Onwuemesi E, G. Chukwurah O, and M. Officha C. “Effects of Open Cast Quarrying Technique on Vegetation Cover and the Environment in South-Eastern Nigeria”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 21, no. 1, July 2016, pp. 227-40, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1746.