1. National Research Institute of Astronomy and Geophysics NRIAG, Helwan, Cairo, Egypt
2. Geomagnetism and Geoelectricity, National Research Institute of Astronomy and Geophysics, Cairo, Egypt
3. Geology Dept. Faculty of Science, Al-Azhar University, Cairo, Egypt
4. The General Company for Researches and Groundwater & Green Valley for Logging, Egypt