1. Al-Qudami MD, Shehata WM, Al-Harti AA, Sabtan AA (1997) On the weathering of syenite under arid conditions. Bull Int Assoc Eng Geol 56:3–8
2. AFNOR (L’ Association Francaise De Normalisation) (1980) Essai au deu methylene. P18–592, AFNOR 80181, Paris La defence
3. ANON (1970) The logging of rock cores for engineering purposes. Q J Eng Geol 3:1–24
4. ANON (1972) The preparation of maps and plans in terms of engineering geology. Q J Eng Geol 45:293–382
5. ANON (1977) The description of rock masses for engineering purposes. Q J Eng Geol 10:355–388