1. Physical background, soils and land use and ecological problems;Akwa Ibom State,1989
2. Standard Methods for the Examination of Water and Wastewater;American Public Health Association,1985
3. Geochemistry of groundwater in the Chad Basin;Arad;Journal Hydrology,1975
4. The Na'aman springs, northern Israel: Salination mechanism of an irregular freshwater-sea water interface;Arad;Journal Hydrology,1975
5. Review of the stratigraphy, sedimentation and structure of the Niger Delta;Asseez,1976