Akanwa O, Angela, Faustina Onwuemesi E, Gladys Chukwurah O, and Maurice Officha C. 2016. “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 21 (1):227-40. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1746.