00277nam a2200097Ia 4500008004100000041000800041100001400049245004000063260005700103999001900160231107s1990    xx            000 0 und d  aeng  aB.N.Datta  aEstamating & Costing in Civil Engg.  aNew DelhibUBS Publishers Distributers Pvt.Ltdc1990  c922025d922025