Daoud, A. M. A., M. A., R., Sediek, K. N., A. M., E. and A. M., E. (2020) “Barite Concretions in Wadi Halfa Oolitic Ironstone Formation, North Sudan”, Journal of Geography, Environment and Earth Science International, 24(5), pp. 51-64. doi: 10.9734/jgeesi/2020/v24i530227.