00434nam a2200109Ia 4500003000400000082001700004245012700021260005400148300001000202650002300212653008900235SGT  a620.136bMEH  aProceedings of the international symposium on conncrete technology for sustainable development in the twenty frist century  bCement Manufacturers AssociationaNew Delhic1999  a637p.  aCIVIL ENGINEERING   aCONCRETE TECHNOLOGY FOR SUSTAINABLE DEVELOPMENT AN OVERVIEW OF ESSENTIAL PRINCIPLES