Lime stone quarrying pollution and control (National Cement Company)
By: Zahran, Adil Abd al-Rahman; Ismail, Ismail Ahmad; al-Sai, Ahmad Awwad. Assiut University Bulletin for Environmental Researches. Vol. 11, no. 1 (Mar. 2008), pp.1-9, 9 p.
Subjects: Egypt; Helwan; Environmental aspects; Noise