TY - THES A1 - Narra, Satyanarayana T1 - Structural amelioration of clay-sand substrate using FGD Gypsum as a substitute for Lime in recultivation of virgin soil at post-mining field Nochten (Lusatia) under soil physical and plant growth aspects Y1 - 2008 SN - 3-937728-11-2 PB - BTU CY - Cottbus ER -