1. Al-Sayari, S., and Zoettl, J., “Quaternary period in Saudi Arabia” (Springer-Verlag, Wien, New York, 1978).
2. Oweis, I. and Bowman, J., ‘Geotechnical considerations for construction in Saudi Arabia’,J. Geotech. Eng. Div. (1981).
3. Zein Al-Abidien, H. M., ‘Properties of the aggregates for concrete in Saudi Arabia’, Paper submitted to the first Saudi Engineering Conference in Jeddah, 1983.
4. Ministry of Public Works and Housing, Riyadh, Internal reports on mineral aggregates for concrete in the Kingdom of Saudi Arabia: Part 1: ‘Wadis of the western region’ (1980). Part 2: ‘Natural sands of the eastern region’ (1981). Part 3: ‘Crushers of the eastern region’ (1981). Part 4: ‘Crushers of the western region’ (1981). Part 5: ‘Wadis, natural sands and screening plants of the central region’ (1982). Part 6: ‘Crushers of the central region’ (1982).
5. ASTM C127, ‘Standard test method for specific gravity and absorption of coarse aggregate’ (1973).