1. a University for Development Studies – Nyankpala Campus, Tamale, Ghana 1882, Ghana
2. b Department of Environmental Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana, Ghana
3. c Department of Geological Engineering, School of Engineering, University for Development Studies, P. O. Box TL 1350, Tamale, Ghana, Ghana
4. d Department of Agricultural Engineering, Ho Technical University, P. O. Box HP 217, Ho, Ghana, Ghana