1. Faculty of Arts, Letters and Social Sciences, University of Maroua, Maroua P.O. Box 644, Cameroon
2. Water Institute, Ministry of Water, Dar es Salaam P.O. Box 35059, Tanzania
3. Department of Geography, University of Yaoundé I, Yaoundé P.O. Box 755, Cameroon
4. Faculty of Science and Technology, Campus of Banekane, Université des Montagnes, Bangangté P.O. Box 208, Cameroon
5. Department of Chemistry, Faculty of Sciences, University of Douala, Douala P.O. Box 24157, Cameroon
6. Department of Applied Geology, University of Göttingen, Goldschmidtstraße 3, D-37077 Göttingen, Germany
7. Grassland Science and Renewable Plant Resources, Faculty of Organic Agricultural Science, University of Kassel, Steinstrasse 19, D-37213 Witzenhausen, Germany
8. Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, D-14469 Potsdam, Germany
9. Centre for Modern Indian Studies (CeMIS), University of Göttingen, Waldweg 26, D-37073 Göttingen, Germany
10. School of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, China
11. Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania